Really well put together video buddy! The brass tip insert making such a change is mainly down to 2 things. 1. The tip has introduced a change in internal diameter, creating a small choke point. You can hear the interruption in flow on the cold start clip, where there is a slight "hiccup" before the flow corrects itself. 2. The extra weight on the end due to the difference in density changes the harmonic frequency running through the pipe, in much the same way weighted bar ends do on a motorcycle handlebar. You would get a similar effect, albeit less pronounced, with a rolled tip on the steel pipes, be it inwardly rolled/outwardly rolled. The brass pipes sounded much nicer than either steel option, giving a deeper, richer tone through my earphones. Not sure its worth the ten fold price increase over mild steel though. Again, great video, really enjoyed it. Would be keen to see other materials tested such as copper or aluminium, finances allowing. Keep up the good work sir. 💪🏻
Thank you so much for this explanation. Can i pin it? Because i think this is what happened in this video. Clearly im not an expert, i just turn wrenches lol
@OEMplusRESTO you're very welcome friend. Of course, feel free. I'm far from an expert myself, just a fabricator with a keen interest in flow dynamics, so exhaust & intake systems hugely interest me. I'm currently welding cast iron pipe whilst listening to your airbox to cone filter comparison. Really good work. 👍🏻
@g.w.customcreations3534 thank you. Cast iron?? I though brazing was hard lol. I took my first attempt at a full brass exhaust yesterday using brazing but holu hell it was hard. Cast iron is even worse ive been told
@OEMplusRESTO yeah, brazing can be difficult. Are you using oxy-fuel or TIG to braze? Cast Iron has its difficulties, but once you have the knowledge, it's not too challenging. Having an older mentor, much like you & your father, helps a great deal. They've already made the mistakes, and can teach you how to avoid them. The older generations are worth their weight in gold, so it's worth the time to listen. 😁
For my STi there are stainless, titanium, and aluminum available for catback exhausts... Once my mild steel 3in rusts out I'll be looking for something else.
Agreed, 0.05 seconds is not really perceivable or repeatable and is certainly within the margin of error. Secondly, 5db is definitely observable, and you can hear that difference immediately. I am very happy to see the brass experiment. There will be a huge difference in resonant frequency, and I always love materials comparisons!
This was a fun test. I installed many many many exhaust systems. The best sounds always came from the thickest/ largest diameter pipe. Ive even used an old semi driveshaft as exhaust. Everything I've ever put together changed immediately with the right tips. Thick double layered stainless tips have always been my favorite. But i like the brass.
Which was the worst? Straight single wall? What about those "resonated" tips, which look like a combination of double wall and rolled edge, but with perforations and the tiniest bit of packing in it?
This is the perfect explanation of, what happens to sound in density/denser objects? The more density you have, the more sound makes it out of the hole than thru the side of the pipe.
@kyleteal5888 Density, of course, is a great consideration in this matter. However, length and diameter also play an important role in resonant frequency calculations. You could add this to both the length and ID of porting calculations. Similar to what is done for a subwoofer enclosure. The last variable to consider is the volume of the chamber. Adding all this with the density of the material and you have so much to play with!
From my own personal experience: I had the TA Technix Muffler on my E46 320i with the M54B22. At first it sounded pretty much stock, but after a couple hundred to thousand kilometers of autobahn driving (basically a minimum of 3500-6000rpm constantly) it really burned free and was quite loud, and it sounded pretty nice. For a price of 180€ with a homologation in Germany (Teilegutachten) it was well worth the money! Edit: The fitment is tricky to get right, but you basically have to, for one, play around with the mounting system and adjust it so it sits flush and straight, and you can also twist the muffler a very tiny bit to get it to sit straight. I was sitting very nicely on my E46. The different length mounting pipes were miserable, I had to weld a piece of tubing to it to get it to fit, I had the same problem you had. Also I loved the different length end pipes, those made it look much better imo. In the end it was a bit finicky, but when you play around a bit you can get it to sit flush and straight!
Great test. I got a custom Magnaflow stainless cat back system on my Mitsubishi. And at first it was a bit raspy, but the mechanic said it would smooth out a bit when it gets a layer of soot in it, and this was so true, after a couple of months it had a different sound to it, a bit deeper.
The amount of work put into this video is incredible! I too was holding onto the edge of my seat waiting to see what the brass pipes sounded like. As unfortunate as they were, I think the fact that we've figured out that brass tips make a difference to tone and drone is excellent. At least through the mic, the pipes sound better than the mufflers because they have a deeper 'growl' to it. In person though, I DO know that what sounds deeper on the mic often is much dronier in real life. Excellent video, love your level of care throughout these videos. All the little details make the difference. You've even gone above and beyond to do acceleration tests. As for the difference in performance, I reckon it has to do with back pressure. With the TA Technix muffler you probably have the perfect amount of back pressure compared to the restrictive stock muffler, and then with the pipes you might have TOO much back pressure causing you to lose power instead. Just a theory but this could be the case.
@@OEMplusRESTO No worries! You earned yourself a like and a new subscriber. Looking forward to what else you figure out. I watched your intake video too before this one and that impressed me too :)
Back pressure is a myth. You only need an ideal diameter for proper flow but not necessarily a restrictive pipe. Everything else is your statement I do agree. It was barely perceived, but the note with brass pipe seemed deeper
The SS definitely sounds better than the MS, even if it's not any louder/quieter. I was pretty surprised by how much the brass tips made a difference all around! I want some brass tips, now! Especially since it matches my wheels, shift knob, etc. :) Thanks for all the testing.
Great video, there’s something also worth considering, the brass will be more sensitive to resonance, so tuning the length and diameter of the pipe is also a fun test you can do
Something interesting about sound / pressure waves that is likely the reason for the tips making a difference in the stainless exhausts is that if a pressure wave travels into an area with a suddenly smaller or bigger cross section it causes a difference in 'acoustic impedance' so some pressure waves can be resisted or bounced back by the sudden transition, so the fact the tips suddenly neck down and then flare out probably causes the fast and weak higher frequency pressure waves to be bounced back partially, reducing the high pitch droning sounds a little bit. Sorry if this gets a bit lost in Translation please look into it if your interested my explanation is probably not the best, keep up the awesome stuff and I hope your having fun :)
I once lived next to a guy that started building t-buckets in the 50s. He once told me that they would cut up brass beds for the pipe, and then string a piano string- I can't remember which, tight between two screws to get it to "ring" You already have some brass pipes...
@@OEMplusRESTO unfortunately I do not, and it's been some time since that gentleman passed away. It sounded like the string would be out in the air, so they might have even ran the screws all the way through and strung the string between before even installing the pipe.
one thing that would be nice is cruising at highway speeds. I think that might be where the brass options could shine because they are so good at eliminating drone.
this video is gold information thank you very much ! for curiosity i cutted open my stock 330 muffler and the piping for the valved side is very different than the side without valve . if you want to see the photos inside the muffler just pm me
Intakes make a difference in cooperation with a freer flowing exhaust, so this could be a factor in how the exhaust is working with factory intake flow.
@OEMplusRESTO you bloody legend. GET ME IN ON THIS SHIT. I've been making custom stainless exhausts for a while now and resonance and tone is everything
Another awesome video to see! :) Can't wait for next! Cool how the brass tips really changed the sound! And free flowing exhaust is always gonna be better, you never want any backpressure on a 4stroke, doesnt matter if its NA or turbo/supercharged.
@@OEMplusRESTOI’ve done a good amount of testing on my own personal car, and an ungodly amount of research, back pressure on four strokes is no good! I think folks are just stuck on the mindset of two strokes needing it
Jeepers man, appreciate your time. Craft, driving,recording and perfect editing. After watching this makes it clear what were the shiny thing on some harley tips...and good explanation in the pinned post. Effin cool work!
I think, you forgot one test: Brass tubing with the brass tips, because the tips change geometry of the end an manipulate the sound. But I didn't expect the sound difference to be that great, between stainless steel an brass anyway.
Awesome video. I would think because the brass inserts had a lip on them it changes the sound more than the brass pipes. With the inserts your basically creating a whistle like device going from a larger "inlet"(base diameter of the exhaust) to smaller outlet(lip of the brass insert).
Just an FYI, if the valve muffler has had a vacuum line plumbed to it and the computer has been coded for it, the valve will be actuated around 5 minutes after cold start, from closed to open. The valve was meant to meet noise regulations on cold starts.
I try to tell people this stuff thank you for demonstrating. I put new 2" thicker steel duals with aftermarket steel packs on my old 06 Mercury and its the best 4.6 2v sound in the world. Can you show why glass packs suck and to help people get better steel pack resonators free flowing exolaining velocity as well. Shake and bake brass pipes are neat
I was really hoping for a brass tips in brass pipes comparison too. But this video was still great. I definitely heard a difference in tone with each change. And now I know why the titanium exhaust I had that looked identical to the stainless, sounded different in my opinion, but my friends said it was the same. I should have recorded a before/after to prove it.
I think the brass tips added some meat to the end of the tip to help support the end from vibrations and helping resonate the sound. This is just my theory.
This is a great video! I'd wage that while there was just a little difference in sound, it was because you changed only the tip of the iceberg. If you had SS headers and all of the rest in brass, specially the curves, you'd get wildly different sounds! cheers!
Can you do some pipes that get smaller then wider then smaller then wider and repeat over the same distance. See what happens to the wave form? Bet it's sounds mental. Top work
Great video! Thank you! I don't think the fact that the tip was brass made any difference. There are a few things in play here. The tip made the end of the pipe more rigid that reduced the vibrations so it wasn't that raspy. Also the flare you intoruced slow down the sound waves that made it sound deeper.
I really like the different pitch from the brass pipes. I know you already did the straight pipes, but I'd be curious to hear full brass exhaust tips from the back of a muffler, I'd love to see that on the stock muffler but you probably want to keep that intact, so modifying the TA Tecnix would be great as well
Brass pipes and the tips! The diameter change at the tip forms a resonant cavity and it's that effect that you liked in the stainless pipe, so to compare it with the brass you need to replicate the cavity. This means not only a restriction of the same diameter change (I realise the brass is a slightly larger pipe), but also the same length (brass are slightly longer too, right?).
Thank you. Interesting. The brass pipes were 60cm each while the stainless and mild steel were both 50cm The brass was also slighty larger internal diameter than the other two
@@OEMplusRESTO just to be clear: when I say "same diameter change" i mean in percentage terms, not "6mm smaller" or whatever the insert on the 50mm pipe gives. The ratio of wide/narrow channel gives the "strength" of the resonance effect, the length between restrictions ("cavity length" in some literature) gives the frequency spectrum that can resonate to that extent. In optical waveguides you write Bragg Gratings (which are many such cavities end-to-end) to selectively attenuate frequencies, and the theory here is virtually the same. A wave is a wave, and guided wave physics pretty much works analagously regardless.
i'm not sure but i think that the reduction in times from the stock muffler to the other options including the ta is due to the fact that the original muffler has a long path in it that the exhaust gases have to follow, while in the other cases it's just a straight way (if you shine some light at the end of the ta muffler you should see it looking in the other end, on the stock one you shouldn't, and this difference kind of blocks the gases coming out)
I wonder if the sound would change more drastically if the brass pipe was placed toward the middle of the exhaust where the exhaust resonator is located. I think it would have to create different harmonics than steel tubing because of the resonant shockwaves bouncing around off of a pipe with different material hardness properties. If I'm not mistaken theres much more interaction between the pipes and the sound shockwaves toward the middle at the resonator than there are at then end of the pipe where the muffler is located
Brass is easily formed as it's soft. It would be interesting to apply some musical theory with regard to the overall shape of the tips and routing to see how it positively affects sound. The higher pitch compared to stainless would be fun with an X-pipe and a high-revving engine. It likely would scream!
another amazing video, it’s always a good day when you upload! would love to see some testing with resonator 1&2 deletes with stock muffler and such :)
Could very well be. Actually, if you listen to the intro, and then when i repeat it right before installing the brass pipes, you can hear the difference too👀👀
Great video mate, well done! Really enjoyed the comparisons and didn’t expect the brass pipe, nice touch. I’ve recently gone back to stock w/ open valve from a stainless straight through backbox like the ta technix one and have to say it does feel like the car has lost some torque, not really sure why, was expecting the opposite given that the stock exhaust is probably more restrictive. It might just be in my head though as it’s a lot more quiet now.
It sounds deeper on with the brass tips but that doesn't make a tone of sense to me. i just feel like you would need more then just the tips to make a huge difference then what was use but what do i know.
Really great comparison! Loved this one even though i wont be able to either use the intake stuff nor the exhaust stuff here in germany :) Would love to see a comparison with an x-pipe for the mid section! Think that might be really interesting for performance and sound Also great to see how much the channel has grown over the time! As always really nice quality video :) Keep it up!
Thank you. Me neither bro.. i have fitted the stock exhaust and intake already🤣 but the ta technix one is e approved. Isnt that sufficient to have it legal in germany?
@@OEMplusRESTO Yea it kinda is unless you get the wrong police man at the wrong time on the wrong day then it doesnt really matter and the car gets seized by the government :D
@TOTALdAk1nG thats rough.. Its the same in dk i think but i havent had any bad experiences ever meeting a cop, so i hope that will continue. Either way, car is now fully legal again. I will try and get the exhaust valve working again too! Had to manually close it to do tests
OPEN vs CLOSED valve. You did WOT test to see the time. Sure, but what about 1/4 or 1/2 throttle? That where you drive in town with trough the gears. Thats where the values can save fuel ehen closed. Making the exhaust outlet "smaller" should save fuel on low rpm.
I didnt test this as i cant really do that test. But i will say that forcing it closed, it did somehow feel abit more responsive at partial throttle low rpm pull
Really well put together video buddy!
The brass tip insert making such a change is mainly down to 2 things.
1. The tip has introduced a change in internal diameter, creating a small choke point. You can hear the interruption in flow on the cold start clip, where there is a slight "hiccup" before the flow corrects itself.
2. The extra weight on the end due to the difference in density changes the harmonic frequency running through the pipe, in much the same way weighted bar ends do on a motorcycle handlebar.
You would get a similar effect, albeit less pronounced, with a rolled tip on the steel pipes, be it inwardly rolled/outwardly rolled.
The brass pipes sounded much nicer than either steel option, giving a deeper, richer tone through my earphones. Not sure its worth the ten fold price increase over mild steel though.
Again, great video, really enjoyed it. Would be keen to see other materials tested such as copper or aluminium, finances allowing.
Keep up the good work sir. 💪🏻
Thank you so much for this explanation. Can i pin it? Because i think this is what happened in this video. Clearly im not an expert, i just turn wrenches lol
@OEMplusRESTO you're very welcome friend.
Of course, feel free.
I'm far from an expert myself, just a fabricator with a keen interest in flow dynamics, so exhaust & intake systems hugely interest me.
I'm currently welding cast iron pipe whilst listening to your airbox to cone filter comparison. Really good work. 👍🏻
@g.w.customcreations3534 thank you. Cast iron?? I though brazing was hard lol. I took my first attempt at a full brass exhaust yesterday using brazing but holu hell it was hard. Cast iron is even worse ive been told
@OEMplusRESTO yeah, brazing can be difficult. Are you using oxy-fuel or TIG to braze?
Cast Iron has its difficulties, but once you have the knowledge, it's not too challenging. Having an older mentor, much like you & your father, helps a great deal. They've already made the mistakes, and can teach you how to avoid them.
The older generations are worth their weight in gold, so it's worth the time to listen. 😁
Kind of makes me thing of weighted bar ends on motorcycle handlebars. It does change the vibration/feel.
I love the idea and would love to see a full brass exhaust
Would be cool but would absolutely melt under load anywhere before or after collector, from the mid pipe back it may stay for a while.
For my STi there are stainless, titanium, and aluminum available for catback exhausts... Once my mild steel 3in rusts out I'll be looking for something else.
Not to mention brass is HEAVY
Wow the brass tips are amazing change
Tips in general change the sound quite abit being brass or stainless.
The added mass and diameter change with the brass tips has certainly tuned the resonant frequency. Great experiment!
Agreed, 0.05 seconds is not really perceivable or repeatable and is certainly within the margin of error. Secondly, 5db is definitely observable, and you can hear that difference immediately. I am very happy to see the brass experiment. There will be a huge difference in resonant frequency, and I always love materials comparisons!
Thank you for making the time to make this great video
Thank you for watching and commentig. Thats what make its more fun for me🙏
This was a fun test.
I installed many many many exhaust systems. The best sounds always came from the thickest/ largest diameter pipe. Ive even used an old semi driveshaft as exhaust.
Everything I've ever put together changed immediately with the right tips.
Thick double layered stainless tips have always been my favorite. But i like the brass.
Which was the worst? Straight single wall? What about those "resonated" tips, which look like a combination of double wall and rolled edge, but with perforations and the tiniest bit of packing in it?
This is the perfect explanation of, what happens to sound in density/denser objects? The more density you have, the more sound makes it out of the hole than thru the side of the pipe.
@kyleteal5888 Density, of course, is a great consideration in this matter. However, length and diameter also play an important role in resonant frequency calculations. You could add this to both the length and ID of porting calculations. Similar to what is done for a subwoofer enclosure. The last variable to consider is the volume of the chamber. Adding all this with the density of the material and you have so much to play with!
From my own personal experience:
I had the TA Technix Muffler on my E46 320i with the M54B22.
At first it sounded pretty much stock, but after a couple hundred to thousand kilometers of autobahn driving (basically a minimum of 3500-6000rpm constantly) it really burned free and was quite loud, and it sounded pretty nice. For a price of 180€ with a homologation in Germany (Teilegutachten) it was well worth the money!
Edit: The fitment is tricky to get right, but you basically have to, for one, play around with the mounting system and adjust it so it sits flush and straight, and you can also twist the muffler a very tiny bit to get it to sit straight. I was sitting very nicely on my E46. The different length mounting pipes were miserable, I had to weld a piece of tubing to it to get it to fit, I had the same problem you had. Also I loved the different length end pipes, those made it look much better imo. In the end it was a bit finicky, but when you play around a bit you can get it to sit flush and straight!
This is exactly my experience. Except the wearing in part. I too think its a decent buy if you can diy the fitment:)
My metal shop teacher was German from Germany, we got along fabulous he was a great teacher !
German from Germany?
Great test. I got a custom Magnaflow stainless cat back system on my Mitsubishi. And at first it was a bit raspy, but the mechanic said it would smooth out a bit when it gets a layer of soot in it, and this was so true, after a couple of months it had a different sound to it, a bit deeper.
Interesting.
The amount of work put into this video is incredible! I too was holding onto the edge of my seat waiting to see what the brass pipes sounded like. As unfortunate as they were, I think the fact that we've figured out that brass tips make a difference to tone and drone is excellent. At least through the mic, the pipes sound better than the mufflers because they have a deeper 'growl' to it. In person though, I DO know that what sounds deeper on the mic often is much dronier in real life.
Excellent video, love your level of care throughout these videos. All the little details make the difference. You've even gone above and beyond to do acceleration tests. As for the difference in performance, I reckon it has to do with back pressure. With the TA Technix muffler you probably have the perfect amount of back pressure compared to the restrictive stock muffler, and then with the pipes you might have TOO much back pressure causing you to lose power instead. Just a theory but this could be the case.
Really good analysis and thank you for the feedback sir💪
@@OEMplusRESTO No worries! You earned yourself a like and a new subscriber. Looking forward to what else you figure out. I watched your intake video too before this one and that impressed me too :)
@@qwertiee thats very kind of you to say. Thank you.
Back pressure is a myth. You only need an ideal diameter for proper flow but not necessarily a restrictive pipe. Everything else is your statement I do agree. It was barely perceived, but the note with brass pipe seemed deeper
@@OEMplusRESTOHi Mate thanks for the great work, just wondering if you could kindly help me with the link for the TA T echnixx muffler thanks.
Love your excitement & knowledge in these vids. So cool to see all your tests!
Thank you. Im happy you liked it
I like your english accent, but your compare videos are so much better than this ❤
Thx dude for your work!!
Thank you. Alot of people comment on my accent😅 must be very noticeable. I dont notice it myself though🤣
It is very much a Danish accent - fellow dane 🎉
Maan I just ordered a muffler to empty it two days ago and now I see this video, almost perfect timing. Good video.
Would you share photos of the insides somewhere
please post pics of the internals
I did that 40 years ago and it sounded great!
The TA sounded really good..like it should have sounded from factory!! Brass made it sound almost more like E46 m3. Great video!👍
Im not that into the louder setups but i can see why others like them no doubt
This video is going to cost me some money 🙈🤩. Thank you again for a great video. My neighbors are going to be mad😬😬
What you getting? :D
The SS definitely sounds better than the MS, even if it's not any louder/quieter. I was pretty surprised by how much the brass tips made a difference all around! I want some brass tips, now! Especially since it matches my wheels, shift knob, etc. :) Thanks for all the testing.
Great video, there’s something also worth considering, the brass will be more sensitive to resonance, so tuning the length and diameter of the pipe is also a fun test you can do
Oh man. It totally makes sense to me. I think you are really onto something.
Thanks for the effort. You rock man!
What changes the sound more is equal lenght or unequallenght headers and x/h pipes! You should test that too!
id love to
Must try full brass headers and all Polished. Of course. And maybe some valves. Conected to some buttons on the wheel ?
Something interesting about sound / pressure waves that is likely the reason for the tips making a difference in the stainless exhausts is that if a pressure wave travels into an area with a suddenly smaller or bigger cross section it causes a difference in 'acoustic impedance' so some pressure waves can be resisted or bounced back by the sudden transition, so the fact the tips suddenly neck down and then flare out probably causes the fast and weak higher frequency pressure waves to be bounced back partially, reducing the high pitch droning sounds a little bit.
Sorry if this gets a bit lost in Translation please look into it if your interested my explanation is probably not the best, keep up the awesome stuff and I hope your having fun :)
I once lived next to a guy that started building t-buckets in the 50s. He once told me that they would cut up brass beds for the pipe, and then string a piano string- I can't remember which, tight between two screws to get it to "ring"
You already have some brass pipes...
Thank you. Do you know where they attached the strings to make it ring?
@@OEMplusRESTO unfortunately I do not, and it's been some time since that gentleman passed away. It sounded like the string would be out in the air, so they might have even ran the screws all the way through and strung the string between before even installing the pipe.
one thing that would be nice is cruising at highway speeds. I think that might be where the brass options could shine because they are so good at eliminating drone.
The pitch is definitely higher with the brass pipe! That’s really cool, I’d love to hear a full brass straight pipe
I've always liked the sound of straight pipes I've got 3" stainless on my 01 TA after stainless long tube headers
Man this channel deserves more recognition! This is such a blast watching you experiment with your E46!
Thank you. Im happy to hear that
this video is gold information thank you very much ! for curiosity i cutted open my stock 330 muffler and the piping for the valved side is very different than the side without valve . if you want to see the photos inside the muffler just pm me
Id love to. But how do i dm you?
you are making very interesting videos! i love this experiments!
Had a copper straight through on a hemi straight 6. Sounded beautiful❤
The brass had a cleaner less drone deep sound to it. I like it 👌
Thank you
Intakes make a difference in cooperation with a freer flowing exhaust, so this could be a factor in how the exhaust is working with factory intake flow.
Wow thanks for answering a question i had since forever
id love to hear a full brass setup ayy, its so resonant
Im working on it right.. its gonna be loud. Thats all i can say right now😅
@OEMplusRESTO you bloody legend. GET ME IN ON THIS SHIT. I've been making custom stainless exhausts for a while now and resonance and tone is everything
Another awesome video to see! :) Can't wait for next!
Cool how the brass tips really changed the sound!
And free flowing exhaust is always gonna be better, you never want any backpressure on a 4stroke, doesnt matter if its NA or turbo/supercharged.
Yeah i think its a myth that backpressure is needed. And thank you
@@OEMplusRESTOI’ve done a good amount of testing on my own personal car, and an ungodly amount of research, back pressure on four strokes is no good! I think folks are just stuck on the mindset of two strokes needing it
those straight pipes in place of a muffler sounds good.
I wouod love to hear a brass piped v8, i think thats where this mod will shine
I can only imagine😎
Dude, I was waiting for the brass tips on the brass pipe test man! The thickness difrence seems to me like would definitely change the sound!
Hats off to you!!! One of the best videos I have seen in a while!!!!
Jeepers man, appreciate your time. Craft, driving,recording and perfect editing.
After watching this makes it clear what were the shiny thing on some harley tips...and good explanation in the pinned post.
Effin cool work!
Thank you for watching bro. And the kind words. A nice thing to read after a long day of editing so i can release a new video
I think, you forgot one test: Brass tubing with the brass tips, because the tips change geometry of the end an manipulate the sound.
But I didn't expect the sound difference to be that great, between stainless steel an brass anyway.
Awesome video. I would think because the brass inserts had a lip on them it changes the sound more than the brass pipes. With the inserts your basically creating a whistle like device going from a larger "inlet"(base diameter of the exhaust) to smaller outlet(lip of the brass insert).
Wow
We'll never stop to discover new things
In my experience, putting a 3” tailpipe that’s at least 24” long, will deepen the tone of anything.
Didgeridoo
Great video! I’ve been curious about aluminum since it is light and less expensive than titanium.
⬇Try a full length Brass button..🔥🔥🔥🔥🔥
Im on it:)
Just an FYI, if the valve muffler has had a vacuum line plumbed to it and the computer has been coded for it, the valve will be actuated around 5 minutes after cold start, from closed to open. The valve was meant to meet noise regulations on cold starts.
I try to tell people this stuff thank you for demonstrating. I put new 2" thicker steel duals with aftermarket steel packs on my old 06 Mercury and its the best 4.6 2v sound in the world. Can you show why glass packs suck and to help people get better steel pack resonators free flowing exolaining velocity as well. Shake and bake brass pipes are neat
The ford 4.6’s sound great i agree💪
I was really hoping for a brass tips in brass pipes comparison too. But this video was still great. I definitely heard a difference in tone with each change. And now I know why the titanium exhaust I had that looked identical to the stainless, sounded different in my opinion, but my friends said it was the same. I should have recorded a before/after to prove it.
Im tempted to do that as well but i think i have something even better coming up. Just trying to do some research first
Titanium exhaust.. id love to hear that👀
I think the brass tips added some meat to the end of the tip to help support the end from vibrations and helping resonate the sound. This is just my theory.
Sounds plausible and others have said the same so i think youre right
@@OEMplusRESTO I think I'm gonna machine some brass tips for my cars now.
I always get visible happy when I see you upload. My absolute favourite channel 🤙
Thats probably the best compliment ive gotten on yt so far🙏
This is a great video!
I'd wage that while there was just a little difference in sound, it was because you changed only the tip of the iceberg. If you had SS headers and all of the rest in brass, specially the curves, you'd get wildly different sounds!
cheers!
i actually really like the full brass. gave it a more "exotc" sound
That's exactly what happened when music lover is bmw lover as well
Can you do some pipes that get smaller then wider then smaller then wider and repeat over the same distance. See what happens to the wave form? Bet it's sounds mental.
Top work
I have been thinking about a setup like that.. 😀
@@OEMplusRESTO make it happen!!!
Great video! Thank you!
I don't think the fact that the tip was brass made any difference. There are a few things in play here. The tip made the end of the pipe more rigid that reduced the vibrations so it wasn't that raspy. Also the flare you intoruced slow down the sound waves that made it sound deeper.
That makes sense. Thank you:)
I really like the different pitch from the brass pipes. I know you already did the straight pipes, but I'd be curious to hear full brass exhaust tips from the back of a muffler, I'd love to see that on the stock muffler but you probably want to keep that intact, so modifying the TA Tecnix would be great as well
Its a good idea honestly
Brass pipes and the tips! The diameter change at the tip forms a resonant cavity and it's that effect that you liked in the stainless pipe, so to compare it with the brass you need to replicate the cavity. This means not only a restriction of the same diameter change (I realise the brass is a slightly larger pipe), but also the same length (brass are slightly longer too, right?).
Thank you. Interesting. The brass pipes were 60cm each while the stainless and mild steel were both 50cm
The brass was also slighty larger internal diameter than the other two
@@OEMplusRESTO just to be clear: when I say "same diameter change" i mean in percentage terms, not "6mm smaller" or whatever the insert on the 50mm pipe gives. The ratio of wide/narrow channel gives the "strength" of the resonance effect, the length between restrictions ("cavity length" in some literature) gives the frequency spectrum that can resonate to that extent. In optical waveguides you write Bragg Gratings (which are many such cavities end-to-end) to selectively attenuate frequencies, and the theory here is virtually the same. A wave is a wave, and guided wave physics pretty much works analagously regardless.
The only brass piping I had in the car was the last time I picked a brass up and I'm not talking exhaust pipes...
Fantastic video, well explained and direct
I would never have thought those brass ends or tips would have sounded different
i'm not sure but i think that the reduction in times from the stock muffler to the other options including the ta is due to the fact that the original muffler has a long path in it that the exhaust gases have to follow, while in the other cases it's just a straight way (if you shine some light at the end of the ta muffler you should see it looking in the other end, on the stock one you shouldn't, and this difference kind of blocks the gases coming out)
Good point.. and true
This was really well put together! Thanks.
Ive also wondered about doing thermal coatings like cerakote and or some of those insulating aero beads.
Now that would be cool. To mess around with coatings or insulation as well
Very, very interesting results. Thank you!
Thank you for watching
its honestly probably the weight decreasing some of the resonance
Best tuning , weight reduction , probality, rear seat full ,And trunk clear, ,looks time 50-110km , testing
I have to give you credit that video is a lot of work 👍👍
I've often wondered what other metals sound like if used for the entire exhaust. Aluminum comes to mind (weight mostly lol), but also carbon fiber.
This video is gold. So much info you absolutely can’t go wrong ❤
Virkelig informativ og gennemført video.
Næste step er at forsøge Titanium. :)
NGL I wanna do this now. It seems like the brass adds a little more bass to the exhaust note
Even when I was a kid getting my license I wanted a quiet car, I want to hear what's going on inside my engine
I wonder if the sound would change more drastically if the brass pipe was placed toward the middle of the exhaust where the exhaust resonator is located. I think it would have to create different harmonics than steel tubing because of the resonant shockwaves bouncing around off of a pipe with different material hardness properties. If I'm not mistaken theres much more interaction between the pipes and the sound shockwaves toward the middle at the resonator than there are at then end of the pipe where the muffler is located
the brass tips look good.
You should try free floating the brass pipes. Clamping them tightly might be messing with the resonance.
God catch. Thanks for the tip
Brass is easily formed as it's soft. It would be interesting to apply some musical theory with regard to the overall shape of the tips and routing to see how it positively affects sound.
The higher pitch compared to stainless would be fun with an X-pipe and a high-revving engine. It likely would scream!
That exhaust sounds like my first car, i put a Bee R rev limiter. Video is in my channel!
Another interesting experiment. Looking forward to your next video.
another amazing video, it’s always a good day when you upload! would love to see some testing with resonator 1&2 deletes with stock muffler and such :)
Thank you. I did consider it but all i could read online was that it would drone too much:/
I thought you were going to do a full brass pipe exhaust maybe new video
I am. Currently underway. Im a little slow though as its not easy, nor cheap
this is super cool thank you for exploring our thoughts for us
The tips might also be just because the sheer mass on the end. Still very interesting
Could very well be. Actually, if you listen to the intro, and then when i repeat it right before installing the brass pipes, you can hear the difference too👀👀
It will be interesting test a sport catalyst ( 200 cells ). HJS is a good brand.
Awesome garage :o
It's crazy, when u try the TA one, looks like it rev higher than the stock one
Thank you:)
I was hoping you would try the brass pipes with the brass tips. They should make more of a difference.
Yes.. i should have. Didnt think that far at the time:/
Great video mate, well done! Really enjoyed the comparisons and didn’t expect the brass pipe, nice touch. I’ve recently gone back to stock w/ open valve from a stainless straight through backbox like the ta technix one and have to say it does feel like the car has lost some torque, not really sure why, was expecting the opposite given that the stock exhaust is probably more restrictive. It might just be in my head though as it’s a lot more quiet now.
Thank you. Yeah placebo is one helluva drug lol. Which muffler did you have? One of the super expensive ones?
@@OEMplusRESTO just a cheap ebay one, I belive the brand was direnza or gravity. Seems to be one a couple of ebay brands sell as their own.
Interesting. Nice testing and Results.
Thank you
Very in depth as ever Tim. Top work😊
interesting stuff, wonder what other materials could be tested, titanium obviously, but maybe aluminum and copper
I fear they would deform depeding on thickness and placement and many other things but certainly interesting
Thank you again for another great video brotha, you are doing so much for e46 enthusiasts, your videos are extremely helpful and very appreciated.
Thank you for your continued support. It is much appreciated❤️
Great job/video! I appreciate your endeavor!Would love to see a comparison on American V-8 setup.🤔👍
Me too bro.. i have had a few so theyre no strangers to me
Im assuming you changed the stainless steels resonance when you tapped the brass rings on. like holding a cymbal to mute it.
You've been reading my mind
Excellent, entertaining and informative. Such a well put together video that this is the first time I have ever commented and liked.
Thank you sir. Im honoured😎
It sounds deeper on with the brass tips but that doesn't make a tone of sense to me. i just feel like you would need more then just the tips to make a huge difference then what was use but what do i know.
Really great comparison!
Loved this one even though i wont be able to either use the intake stuff nor the exhaust stuff here in germany :)
Would love to see a comparison with an x-pipe for the mid section! Think that might be really interesting for performance and sound
Also great to see how much the channel has grown over the time!
As always really nice quality video :)
Keep it up!
Thank you.
Me neither bro.. i have fitted the stock exhaust and intake already🤣 but the ta technix one is e approved. Isnt that sufficient to have it legal in germany?
@@OEMplusRESTO Yea it kinda is unless you get the wrong police man at the wrong time on the wrong day then it doesnt really matter and the car gets seized by the government :D
@TOTALdAk1nG thats rough.. Its the same in dk i think but i havent had any bad experiences ever meeting a cop, so i hope that will continue. Either way, car is now fully legal again. I will try and get the exhaust valve working again too! Had to manually close it to do tests
OPEN vs CLOSED valve. You did WOT test to see the time. Sure, but what about 1/4 or 1/2 throttle? That where you drive in town with trough the gears. Thats where the values can save fuel ehen closed. Making the exhaust outlet "smaller" should save fuel on low rpm.
I didnt test this as i cant really do that test. But i will say that forcing it closed, it did somehow feel abit more responsive at partial throttle low rpm pull
great video. keep it up! :D
next comparison could be about resonator delete, small resonator and big resonator