lol, +90hp is not a fail, that was a master stroke of enginerding and I’m here for it! So rad. I’m like 70/30 function/form though, and love good noises. Have to be able to drive it comfortably for those extra ponies to be useful 😊
@@sepg5084 Absolutely, the people who cant afford real HP want that F1 sound, the guys that want real performance will take the HP over the sound. I would bet a lot of people that complain about the sound of the first design in lieu over the power gains dont have the money or knowledge for a performance car.
@@sepg5084 The purpose was to make power and it made tons. How can people call a power mod a fail due to the sound? Your comment is rude but just highlights your ignorance
@@fastone371 People who can afford and actually want real HP don't go for the first exhaust they made. People with knowledge and the sole ambition to make power would've gone for a simpler design and spent the money on research and development (dyno, adjust, dyno, adjust, etc.). The theory originally used only gets you so far. Ironically the simpler design would've netted a more "F1 sounding" result, as that's what they used in F1. The "F1 sound" is the result of pursuing power. Not that a 90hp gain over stock is anything to turn your nose up at, great gains.
@FluidMotorUnion I would love to see a solid exhaust set up for k20/k24 engines. Especially without rasp or tinny accents in the sound it produces - what you usually hear in an average honda. If yall could put that in the drawing board it would be huge❤
For a car that revs to 9000 rpm but only a little 2.0L 4 cylinder i've ALWAYS wanted a perfectly tuned f1 sound from my s2000. It's supercharged which changes things from the stock engine note but man it'd be lovely.
I prefer the first version. To me, it sounded more like a race car, where performance is the primary goal and sound is secondary and the second exhaust sounded like all other aftermarket exhausts. When you are dealing with high end exotics, to get +90 hp over a stock is an incredible achievement. You guys rock.
Excellent video, the critics probably don’t have the years of exhaust modification compared to your shop. It would be interesting to see a video on an exhaust system for a 4 cylinder Japanese brand car.
@@neion5044 It sounds way better, way more brutal, matches the character and appearance of the car. It's not a pretty refined 458, it's a matte black batmobile
Engineering meets art when it comes to designing exhaust systems. I think calling it a fail was unfair and harsh! The gains were definitely worth it, and the tradeoffs when it comes to the aesthetics of the exhaust note is simply part of the beauty. The brutal raspy sound means business. Oh man you really hit the nail on the head for that F1 sound though. I'm very impressed!
Same here, LSC brought FMU to my attention and i instantly subbed, i know where i would go if i was in the USS and wanted a built exhaust thats for sure.
Ive always thought it would be fun to grab an oldschool mercedes v12 and build it to have incredible f1 sounding exhaust. Not necessarily super fast, but a sleeper with sound more than speed.
@@idokwatcher2062it screams like hell at 30 because he's tach-ing it out at redline 2-3 gears too low just cruising around. A stock exhaust with a sport muffler would be screaming with a much worse pitch if driven the same way
@Haulinbassracing well yeah that's the fun part. The whole point of this is that Sasaki san clearly has figured out how to make headers that scream and is charging a hefty amount of money to do so. I've only seen a couple of other people on RUclips successfully build one and both meisteer and BIY are attempting to do it without a huge amount of success on his v12 and their v10 despite both being even fired.
That's almost the opposite of what a "sleeper" is. The idea of a sleeper is a very fast car that doesnt look, and preferably sound, fast. Like...take a grocery getter, give it a supercharger and a decently strong muffler to get the sound down, etc, maybe short tubes before the cats. The concept is that people think your car is slow then you smoke em at the track. A car that sounds super fast at 30mph is...basically the opposite.
OJ and Fluid Motor Works do exceptional work. I don't think the average Joe really understands just how complicated the science is regarding internal combustion engines and exhaust optimization. OJ has forgotten more about building exhaust systems than most of these negative commenters will ever begin to understand.
I’ve always appreciated the science behind all things automotive. OJ’s approach to making each vehicle unique and what the owner wants is the true mantra of a “custom” shop. I also can appreciate the quality of his videos including the post editing, his dialog, added views and diagrams etc. Thanks for the hard work on these videos and vehicles OJ and Team!
Take an engine that is universal disliked for its sound, and spin it up… no stepped headers and a turbo in the way… ruclips.net/video/XvBH8jTv9EQ/видео.htmlsi=bNMbepkQ-s3lfygS Stepped headers are only “magic” if the motors magic to begin with. The point of this video stands…
Acoustics and fluid dynamics, being independent concepts, is why the best flowing exhaust might not necessarily "sound" the best. LOVE the level of ingenuity & dedication behind your work!
Y'know... Toyota's GR trim level includes some inline 3 cylinder engines. The 120° pulse spacing could be fun to play with. Also, VW's narrow angle VR6 has lots of character. Another good potential candidate.
“Less than impressed,” and “the gains weren’t worth it?” OJ, let me at ‘em. These CHILDREN could use a good backhand! Your finished products are a dream, my man! Wish I could bring my (weak, only a V-6) 2020 Jeep Grand Cherokee Limited X to get the Fluid MotorUnion touch all the way from Phoenix, AZ. As for your question, please make ANY Porsche sound FMU worthy. Cheers!!!
Id love to see something for the new Nissan Z or The new Lotus they both look great but ESPECIALLY on the Z the sound is overly roomba-esque:\ would be awesome to see y'all really bring those to life
A lot of chevy truck owners are starting to make their exhaust equal length, to make it sound like a Corvette. Its becoming a trend. Maybe you can make a video about this. You can also get a supercar sound if you make your headers equal length. For example Celeritech makes it. There is a video on RUclips, they put it on a LS3 Corvette, it changed the sound to a Ferrari. Just some ideas for you.
The key factor in how they made that f1 sound was how it was an 8-4-1-2 exhaust. Tons of merges causing more pressure waves. I agree that most engines can sound pretty high pitched with the right formula
1. Adding 90hp is not a fail, even if the sound isn't as expected. You should be proud of it. 2. I know its a looooong shot but I'd love to see you do a fwd 3800 exhaust.
I would love to see what yall could do for a acura rl. These cars had the same block design as the acura nsx and with a simple muffler delete it sounds fairly good. Could only imagine how one of these cars could scream
The inverse of your relationship of engine/port/exhaust is also true regarding intake runners. This is the concept that came onto tuned port injection in the 80s. As long as you can create a full or quartet sine wave that can be measured, all other factors can be manipulated
Those guys at build it yourself are doing some wild stuff on that build, I'd suggest anyone who is interested in how far two guys with some ingenuity can go, to subscribe. When they released that video I thought what a cool colab that would be if they could have a video conference with FMU to get some ideas.
Yea I follow them but took one look at the zipper pipes and u bends… also no stepped headers with that beautiful merge? I’d love to test that collector out to see what kind of performance gains and sound I could get with that!
@@FluidMotorUnion yeah they obviously have some bigger things they are wanting to get done with it so headers that fit right now is probably the priority, but later down the road, it would be cool to revisit it
@@FluidMotorUnion We are curious as to what about zipper pipes dont affect sound like x pipes? The setup was purely for testing the effect on sound, not for looks. Also interested in understanding why you feel stepped primaries are needed? We are aware of many great sounding cars (LFA, Zonda, that Aventador you just showed) without stepped primaries. So they are not a requirement for great sound, but do help broaden the torque band slightly.
Been following your guys build for a min super impressive in every aspect. I never thought you get those welded heads to hold!!! Expanding the pipe diameter quickly splits the pressure wave. This can add to the pitch by having more pressure waves present in the system. More pressure waves… more “buzz” or vibration that is possible at a lower rpm. As far as the zipper pipe. We’ve tested every bank blending configuration over the years. Power is dependent on placement and location- but on sound these things are true: Nothing sounds better than an 45 degree x. All x’s will induce turbulence and can only ever truly scavenge in a narrow RPm window. While zipper pipes are used by some people who say they give a certain tone… they induce more rasp and turbulence that you can hear everywhere else. Honestly I feel the they are gimmicky and offer no advantages over a smooth merge x. Would love to colab with you guys and get a proper x and our megaphones to see if we can get that thing to really sing…
Sound good for both version, but to unlock the f1 kinda sound is the equal length header. Just a hear change can make car sound like f1. I remember there is video porsche 992 GT3 with equal length header and stock exhaust, sound good with pitch but less loud..
You should play the game that not many play, and figure out rotary engine exhaust sound tuning. Having 3 combustions per exhaust port, and having essentially 3 ports, where one is shared between the two rotors. You get to tinker with a lot more. Does making the shared port a different length change anything? Who knows! (Yes, this only really works with slower naturally aspirated engines, but still.)
Similar to a gun barrel how it’s bored and rifled on the inside to give bullets a spin before exit, what if you rifled the inside of the exhaust pipes to give the air a “laminar flow” by giving it a consistent spin
Audi 3.2 fsi v6 has almost zero aftermarket support but it is a naturally aspirated motor with a crazy 12:5:1 compression ratio. It sounds amazingggg...I have pure straight pipes with an x pipe, and 2 straight through flowmaster mufflers, no cats and no resonators with a 2.5 inch system and it sounds amazinggg. Everyone compliments it. I would love to have a company like this take my car and put alot of thought into an exhaust for it.
OJ you’re gonna have hater’s or don’t like this and that! That was a peace of art. I liked it. I’m glad you’re doing more to help people understand how exhausts work! Doing great get this channel going hit and subscribe please.
Man, this really makes me want to see what you guys could do with something like the old Datsun L series engines that sound amazing. Especially now that I have one.
Easy, find a engine with a grater bore then stroke and even firing order, then give it Equal length pipes. Or sequential equal length headers if the firing order is odd 8-4-2-1 for the LS for example. Firing order might be the most important factor in engine sound and a lot of people overlook the science behind good acoustics.
Amazing pipes! I love the design, the first one was great, and the second was great. You are very talented guys! I would love to hear your work on DODGE Challenger Hellcat!
This right here is why guys like FMU are worth their weight in gold. THEY are the ones constantly pushing the envelope making the whole industry better and better. The big car manufacturers don't. Its the guys like FMU who take the time to fully understand what is going on and why. They find the best materials to use and the best techniques. This new exhaust sounds badass!! Lamborghini didn't achieve this sound, FMU did. You guys are legend. ❤
Stellar work, never heard a better sounding Aventador, huge props not just for the work but also for expalining how and why, instantly subbed after LSC brought you guys to my attention.
I put a reverse cone on my geo and now above peak torque it rasps harder than a bong juice soiled civic hitting vtec coming out of a car meet. It did however move up the resonance that used to be around 2000rpm up to above 3300rpm, which is interesting and goes back to your previous points about the necessity of testing different configurations to find what works.
I’d love to see you come up with a Nissan Z exhaust that sounds awesome. The Z is sick but for some reason the stock exhaust is so bland compared to the 350 or 370z. That would be a cool project imo.
Seen you're in Naperville lol, though it was Southern California at first. Great shop! My father repaired Porsche in the Chicago area many years ago. Perfect Power was the most well known shop he wrenched for. Great work, got me to subscribe
Although it would probably lose power, I've always wanted to hear what a duel header system would sound like. In other words each primary would split into 2 different primaries. One set of primaries being long tube, and the other being shorties, then having an 8-1 on each bank, then an X in there or even just a 2-1. This would STRICTLY be for sound.
Alright, OJ, consider this the gauntlet officially being thrown down... "With the right design, you can make any engine sound it's best." PLEASE make the world's best sounding Prius! 🙏🏻👍🏻
13:40 sounds like a modern mix of the Ferrari 312 and a Ferrari 1512. Maybe a BRM p180. I commented on the first video saying it sounded muted and muffled but I failed to realize that the goal was pure numbers. 90 from just the exhaust system is crazy...
Very curious to see what you could do with a four-cylinder turbo engine. It's the world's most ubiquitous engine configuration and it often gets maligned due to the unsavory things a lot of shoestring budget folks have done to them. Wondering if a megaphone and tasteful flow-through resonator would clean up the sounds on a turbo inline-4 and make something special instead of just another tone among a dozen aftermarket tones.
Alfa Romeo Quadrifoglio, either Stelvio or Giulia. They have a couple of aftermarket exhaust systems but the stock with a cat delete honestly sounds the best.
In regards to the engine itself, bore/stroke ratio can make a big difference in exhaust note too. Even with nearly identical setups (header included), at the same RPM, a 2J will sound different from a B58 because the latter has nearly 10mm of extra stroke. 4N motorsport’s destroked N55 is an excellent example of this: it sounds so different to a stock internal N5X with the exact same turbo/exhaust setup.
Hey guys, love the videos. Very interesting and different type of content. Can you build one for an E9X M3? I want to see how close we can get it to a F1 noise or a more exotic tune.
You got a hundred horsepower out of a header tune... That's incredible.. I'm proud of you... I've tried to find all kinds of information.. I've poured over david visard's... He's about the only. One I will actually listen to... You're on the right path.Don't listen to these people who just want to be egotistical with how they look or how they sound. The real gears are not the drifters.They're the ones who are trying to get to the finish line the fastest.
I’m over here trying to get my R6 to sound like a F1 car. Finally found an original pair of Ti Leo Vince headers. Should help a bit but I need all the sounds haha
Hi OJ loving the technical aspects of exhaust design and learning a lot from you. I did enjoy the first exhaust on the Lamborghini very raw and unique and absolutely beautiful work that needs showing off What engines to work your magic on? It has to be 5 cylinder the Audi Quattro is my favourite sound of all but very rare in the states. How about a Volvo 5 pot or A Ford focus R/S? Or do you think you could work your magic on a 9000 rpm Honda K20/24? Keep making these very informative vids. Thanks Phil
Id love to hear a ford 4.6 4v done right. With all the coyote stuff these days, the old 4.6 gets forgotten, and even tho they dont make the power of a coyote, most agree, the 4.6 sounds better!
The analogy to a brass instrument is a good one. For example, french horns have that soft smooth sound because they have tubing that's tapered along its full length, not just at the bell. Similarly the difference between a baritone and euphonium is that tapered tubing. Think of Hans Zimmer horn blats (straight tubing, bass trombone etc) vs. smooth french horn tones like on After The Goldrush by Neil Young. I don't think you're actually hearing a "higher pitch" tone. You're hearing an emphasis of the fundamental. For example that V12 at 8k rpm has a fundamental of 800hz, which is what you hear. To accentuate this further an exhaust could be designed to resonate at that frequency, but that's typically difficult due to the lengths and diameters of the exhaust. So for example a Triton V10 (like that 2v head there) would only have a fundamental of 500hz at 6k rpm. You can also accentuate this by softening the higher harmonics using absorption style mufflers like the typical straight through resonator.
OJ listened to the critics, didn’t get butthurt, and said “challenge accepted.” You gotta respect this guy and his shop.
This right here is how you know for certain that OJ and FMU are true professionals through and through.
We appreciate everyone’s support. ❤️
Some F1 sound for a C6 Corvette.
I swear this better not be about OJ simpson
Hell yeah!
lol, +90hp is not a fail, that was a master stroke of enginerding and I’m here for it! So rad. I’m like 70/30 function/form though, and love good noises. Have to be able to drive it comfortably for those extra ponies to be useful 😊
The 1st exhaust sounded nice. Raw and made tons of power .. ppl are insane
What's nice and what's not is subjective. Learn something new everyday, kid
@@sepg5084 Absolutely, the people who cant afford real HP want that F1 sound, the guys that want real performance will take the HP over the sound. I would bet a lot of people that complain about the sound of the first design in lieu over the power gains dont have the money or knowledge for a performance car.
@@sepg5084 The purpose was to make power and it made tons. How can people call a power mod a fail due to the sound?
Your comment is rude but just highlights your ignorance
like a older v12 f1 imo
@@fastone371 People who can afford and actually want real HP don't go for the first exhaust they made. People with knowledge and the sole ambition to make power would've gone for a simpler design and spent the money on research and development (dyno, adjust, dyno, adjust, etc.). The theory originally used only gets you so far. Ironically the simpler design would've netted a more "F1 sounding" result, as that's what they used in F1. The "F1 sound" is the result of pursuing power.
Not that a 90hp gain over stock is anything to turn your nose up at, great gains.
respect for admitting the 1st version wasn't very "F1" sounding
F1 of days gone by you mean.
Both exhausts were insane! Preference doesn’t define failure.
The day you make a common Civic (ex.: B16/B18) sound "non-4-banger ricey raspy" and more harmonious, you WILL win the internet.
@FluidMotorUnion I would love to see a solid exhaust set up for k20/k24 engines. Especially without rasp or tinny accents in the sound it produces - what you usually hear in an average honda. If yall could put that in the drawing board it would be huge❤
For a car that revs to 9000 rpm but only a little 2.0L 4 cylinder i've ALWAYS wanted a perfectly tuned f1 sound from my s2000. It's supercharged which changes things from the stock engine note but man it'd be lovely.
Maisteer started it, thankfully, amazing contribution, thanks!
i6, 6 into 1 and stepped 🙏 if i lived there, would definitely give you guys a crack at my falcon ❤ keep up the awesome work.
I'm running pacemaker 4496 3inch pacemakers with supercharger, 3.5inch after catalytic converter with varex muffler on my territory.
Doing an budget build Atlas 4200 would be awesome
👍
I hope I can make my V12 build sound good 😎👍
I prefer the first version. To me, it sounded more like a race car, where performance is the primary goal and sound is secondary and the second exhaust sounded like all other aftermarket exhausts. When you are dealing with high end exotics, to get +90 hp over a stock is an incredible achievement. You guys rock.
Excellent video, the critics probably don’t have the years of exhaust modification compared to your shop. It would be interesting to see a video on an exhaust system for a 4 cylinder Japanese brand car.
Four cylinder, four valve Honda turbo or NA H22A1 would be awesome.
Screw the haters! I thought the previous system sounded damn good imo. Love the effort though!
it sounds good but sounds terrible compared to even the cars stock exaust
@@neion5044 that’s subjective my guy
@@neion5044 It sounds way better, way more brutal, matches the character and appearance of the car. It's not a pretty refined 458, it's a matte black batmobile
Engineering meets art when it comes to designing exhaust systems. I think calling it a fail was unfair and harsh! The gains were definitely worth it, and the tradeoffs when it comes to the aesthetics of the exhaust note is simply part of the beauty. The brutal raspy sound means business. Oh man you really hit the nail on the head for that F1 sound though. I'm very impressed!
I think this is the first time I've commented on your channel, came here thru Legit Street Cars.
You're doing the Lord's work.
Same here, LSC brought FMU to my attention and i instantly subbed, i know where i would go if i was in the USS and wanted a built exhaust thats for sure.
Ive always thought it would be fun to grab an oldschool mercedes v12 and build it to have incredible f1 sounding exhaust. Not necessarily super fast, but a sleeper with sound more than speed.
Like say a w140 from Japan?
It's been done. It screams like an F1 car while barely accelerating to 30mph. You will easily find it on youtube if you want to hear the beast.
@@idokwatcher2062it screams like hell at 30 because he's tach-ing it out at redline 2-3 gears too low just cruising around. A stock exhaust with a sport muffler would be screaming with a much worse pitch if driven the same way
@Haulinbassracing well yeah that's the fun part. The whole point of this is that Sasaki san clearly has figured out how to make headers that scream and is charging a hefty amount of money to do so. I've only seen a couple of other people on RUclips successfully build one and both meisteer and BIY are attempting to do it without a huge amount of success on his v12 and their v10 despite both being even fired.
That's almost the opposite of what a "sleeper" is. The idea of a sleeper is a very fast car that doesnt look, and preferably sound, fast. Like...take a grocery getter, give it a supercharger and a decently strong muffler to get the sound down, etc, maybe short tubes before the cats. The concept is that people think your car is slow then you smoke em at the track. A car that sounds super fast at 30mph is...basically the opposite.
I like this guy. He breaks it down very well.
Man, that would be the v12 scream if I ever buy an Italian perfection. Amazing job, masters of exhaust. May the force be with you guys.
I prefer the first version. I like raw sound of Can-Am cars and the first exhaust systems was in this style.
Awesome professionalism in the way you handled a TON of negative comments. Keep it up!
Well even in F1 the different engine configurations give different sound.. love the effort and the sound
new exhaust sounds great, love a high pitched exhaust
PLEASE make an exhaust for a Jaguar XJS V12. It would be a challenge for sure!
That sounds WAY BETTER!
OJ and Fluid Motor Works do exceptional work. I don't think the average Joe really understands just how complicated the science is regarding internal combustion engines and exhaust optimization. OJ has forgotten more about building exhaust systems than most of these negative commenters will ever begin to understand.
Good LORD I wish I could like this twice for the sound the first one was good but this is INSANE
The maddest respect for this dude.
Haters are gonna hate. I am always impressed with your work OJ. I’m a fan of the first one as well as this one. You can’t please everyone!
I’ve always appreciated the science behind all things automotive. OJ’s approach to making each vehicle unique and what the owner wants is the true mantra of a “custom” shop. I also can appreciate the quality of his videos including the post editing, his dialog, added views and diagrams etc. Thanks for the hard work on these videos and vehicles OJ and Team!
The sketches were like Overies 😂🤣 probably that's why it screams🤣😂
Stepped headers will make the magic
Take an engine that is universal disliked for its sound, and spin it up… no stepped headers and a turbo in the way… ruclips.net/video/XvBH8jTv9EQ/видео.htmlsi=bNMbepkQ-s3lfygS
Stepped headers are only “magic” if the motors magic to begin with. The point of this video stands…
Acoustics and fluid dynamics, being independent concepts, is why the best flowing exhaust might not necessarily "sound" the best.
LOVE the level of ingenuity & dedication behind your work!
Y'know... Toyota's GR trim level includes some inline 3 cylinder engines. The 120° pulse spacing could be fun to play with.
Also, VW's narrow angle VR6 has lots of character. Another good potential candidate.
O wow the previous exhaust sounded epic, like a 90’s f1 car
All I can say is WOW... What a great solution. Good looking too.
I wish you were closer, would love to have the FMU treatment on my GT350 flat plane crank!
I'd love to hear the FMU treatment on a Voodoo engine!
i would LOVE to see something talking about how to make a turbocharged, specially four cyl, sound good, there is so little information in this topic
I love the fact that you show the creative process. That’s really helpful along with the thought process.
“Less than impressed,” and “the gains weren’t worth it?” OJ, let me at ‘em. These CHILDREN could use a good backhand! Your finished products are a dream, my man! Wish I could bring my (weak, only a V-6) 2020 Jeep Grand Cherokee Limited X to get the Fluid MotorUnion touch all the way from Phoenix, AZ. As for your question, please make ANY Porsche sound FMU worthy. Cheers!!!
Id love to see something for the new Nissan Z or The new Lotus they both look great but ESPECIALLY on the Z the sound is overly roomba-esque:\ would be awesome to see y'all really bring those to life
Well done guys. This is a great demo for all the smooth brains with the nasty comments on the last video.
I like the 1st version equally as much as "REDU-X".
A lot of chevy truck owners are starting to make their exhaust equal length, to make it sound like a Corvette. Its becoming a trend. Maybe you can make a video about this. You can also get a supercar sound if you make your headers equal length. For example Celeritech makes it. There is a video on RUclips, they put it on a LS3 Corvette, it changed the sound to a Ferrari. Just some ideas for you.
The key factor in how they made that f1 sound was how it was an 8-4-1-2 exhaust. Tons of merges causing more pressure waves. I agree that most engines can sound pretty high pitched with the right formula
That ruins the LS. It is to roar not whine.
1. Adding 90hp is not a fail, even if the sound isn't as expected. You should be proud of it.
2. I know its a looooong shot but I'd love to see you do a fwd 3800 exhaust.
I would love to see what yall could do for a acura rl. These cars had the same block design as the acura nsx and with a simple muffler delete it sounds fairly good. Could only imagine how one of these cars could scream
I really liked both exhausts you had on that Lamborghini.🙂
The inverse of your relationship of engine/port/exhaust is also true regarding intake runners. This is the concept that came onto tuned port injection in the 80s. As long as you can create a full or quartet sine wave that can be measured, all other factors can be manipulated
First time finding this channel, very impressed! Good job gents
Glad you enjoy it!
This new setup sounds infinitely better than the previous iteration. Well done 👏
Those guys at build it yourself are doing some wild stuff on that build, I'd suggest anyone who is interested in how far two guys with some ingenuity can go, to subscribe. When they released that video I thought what a cool colab that would be if they could have a video conference with FMU to get some ideas.
Yea I follow them but took one look at the zipper pipes and u bends… also no stepped headers with that beautiful merge? I’d love to test that collector out to see what kind of performance gains and sound I could get with that!
@@FluidMotorUnion yeah they obviously have some bigger things they are wanting to get done with it so headers that fit right now is probably the priority, but later down the road, it would be cool to revisit it
@Keasbeysknight Thank you for the shout out!
@@FluidMotorUnion We are curious as to what about zipper pipes dont affect sound like x pipes? The setup was purely for testing the effect on sound, not for looks. Also interested in understanding why you feel stepped primaries are needed? We are aware of many great sounding cars (LFA, Zonda, that Aventador you just showed) without stepped primaries. So they are not a requirement for great sound, but do help broaden the torque band slightly.
Been following your guys build for a min super impressive in every aspect. I never thought you get those welded heads to hold!!!
Expanding the pipe diameter quickly splits the pressure wave. This can add to the pitch by having more pressure waves present in the system. More pressure waves… more “buzz” or vibration that is possible at a lower rpm.
As far as the zipper pipe. We’ve tested every bank blending configuration over the years. Power is dependent on placement and location- but on sound these things are true: Nothing sounds better than an 45 degree x. All x’s will induce turbulence and can only ever truly scavenge in a narrow RPm window. While zipper pipes are used by some people who say they give a certain tone… they induce more rasp and turbulence that you can hear everywhere else. Honestly I feel the they are gimmicky and offer no advantages over a smooth merge x.
Would love to colab with you guys and get a proper x and our megaphones to see if we can get that thing to really sing…
Great video! Well presented, look forward to watching through more of your content.
Sound good for both version, but to unlock the f1 kinda sound is the equal length header. Just a hear change can make car sound like f1. I remember there is video porsche 992 GT3 with equal length header and stock exhaust, sound good with pitch but less loud..
You should play the game that not many play, and figure out rotary engine exhaust sound tuning. Having 3 combustions per exhaust port, and having essentially 3 ports, where one is shared between the two rotors. You get to tinker with a lot more. Does making the shared port a different length change anything? Who knows! (Yes, this only really works with slower naturally aspirated engines, but still.)
Similar to a gun barrel how it’s bored and rifled on the inside to give bullets a spin before exit, what if you rifled the inside of the exhaust pipes to give the air a “laminar flow” by giving it a consistent spin
Audi 3.2 fsi v6 has almost zero aftermarket support but it is a naturally aspirated motor with a crazy 12:5:1 compression ratio. It sounds amazingggg...I have pure straight pipes with an x pipe, and 2 straight through flowmaster mufflers, no cats and no resonators with a 2.5 inch system and it sounds amazinggg. Everyone compliments it. I would love to have a company like this take my car and put alot of thought into an exhaust for it.
Wow, i just want to say thank you for sharing this. I used to think that i was the only person who obsessed over exhaust in this way.
Thanks for sharing!
I’m definitely coming to you guys for my K48 Celica build
OJ you’re gonna have hater’s or don’t like this and that! That was a peace of art. I liked it. I’m glad you’re doing more to help people understand how exhausts work! Doing great get this channel going hit and subscribe please.
Nothing but respect for this guy! What a shop! But 90hp from an exhaust?! Im all for it lol
Man, this really makes me want to see what you guys could do with something like the old Datsun L series engines that sound amazing. Especially now that I have one.
I think this version sounds much better (through youtube). thanks for the redux
Easy, find a engine with a grater bore then stroke and even firing order, then give it Equal length pipes. Or sequential equal length headers if the firing order is odd 8-4-2-1 for the LS for example. Firing order might be the most important factor in engine sound and a lot of people overlook the science behind good acoustics.
I wish you were in Australia because you are the maestro of exhausts.
lets get that f1 tech onto an already nice sounding platform like the 2j or RB. would love to hear the not from those engines amplified
Yes, 2J with some tweaks for ultimate awesomeness! 😂
Amazing pipes! I love the design, the first one was great, and the second was great. You are very talented guys! I would love to hear your work on DODGE Challenger Hellcat!
This right here is why guys like FMU are worth their weight in gold. THEY are the ones constantly pushing the envelope making the whole industry better and better. The big car manufacturers don't. Its the guys like FMU who take the time to fully understand what is going on and why. They find the best materials to use and the best techniques. This new exhaust sounds badass!! Lamborghini didn't achieve this sound, FMU did. You guys are legend. ❤
Well done 👍🏼
so happy to see this knowledge being shared
Stellar work, never heard a better sounding Aventador, huge props not just for the work but also for expalining how and why, instantly subbed after LSC brought you guys to my attention.
I put a reverse cone on my geo and now above peak torque it rasps harder than a bong juice soiled civic hitting vtec coming out of a car meet.
It did however move up the resonance that used to be around 2000rpm up to above 3300rpm, which is interesting and goes back to your previous points about the necessity of testing different configurations to find what works.
What’s your diameter? How much pipe and muffling do you have after the megaphone
awesome!
I’d love to see you come up with a Nissan Z exhaust that sounds awesome. The Z is sick but for some reason the stock exhaust is so bland compared to the 350 or 370z. That would be a cool project imo.
Seen you're in Naperville lol, though it was Southern California at first. Great shop! My father repaired Porsche in the Chicago area many years ago. Perfect Power was the most well known shop he wrenched for. Great work, got me to subscribe
Although it would probably lose power, I've always wanted to hear what a duel header system would sound like. In other words each primary would split into 2 different primaries. One set of primaries being long tube, and the other being shorties, then having an 8-1 on each bank, then an X in there or even just a 2-1. This would STRICTLY be for sound.
I agree valve events play a big part of sound but so do fuel and hardness of the block and pistons as they resonate at different frequencies
I would like to see an exhaust system for the voodoo Mustang GT350 with its flat plane crank so that it actually sounds like a proper flat plane V8.
That's pretty F1 ish. I best start saving my little dollars to come see you fellas. We'll done!
Alright, OJ, consider this the gauntlet officially being thrown down... "With the right design, you can make any engine sound it's best." PLEASE make the world's best sounding Prius! 🙏🏻👍🏻
I love this… I just need the right circumstances now…
Thanks OJ. Same engine 2 different exhaust systems, more a case of which one do you prefer. I thought the original was a winner 😎
Haters said what!!!?!😂😂😂
Great Comeback . . .mate
13:40 sounds like a modern mix of the Ferrari 312 and a Ferrari 1512. Maybe a BRM p180.
I commented on the first video saying it sounded muted and muffled but I failed to realize that the goal was pure numbers. 90 from just the exhaust system is crazy...
Very curious to see what you could do with a four-cylinder turbo engine. It's the world's most ubiquitous engine configuration and it often gets maligned due to the unsavory things a lot of shoestring budget folks have done to them. Wondering if a megaphone and tasteful flow-through resonator would clean up the sounds on a turbo inline-4 and make something special instead of just another tone among a dozen aftermarket tones.
Alfa Romeo Quadrifoglio, either Stelvio or Giulia. They have a couple of aftermarket exhaust systems but the stock with a cat delete honestly sounds the best.
What an amazing and informative video!! I'm exploring for exhaust ideas for my FE390, I'd love to see what these guys could do with that
Revision definitely gave it a more exotic sound that matches with how the car looks.
The ford raptor/F150 with the ecoboost often sounds like a diesel (they are gas engines). They could use some FMU treatment.
In regards to the engine itself, bore/stroke ratio can make a big difference in exhaust note too. Even with nearly identical setups (header included), at the same RPM, a 2J will sound different from a B58 because the latter has nearly 10mm of extra stroke.
4N motorsport’s destroked N55 is an excellent example of this: it sounds so different to a stock internal N5X with the exact same turbo/exhaust setup.
have you ever tried making a 370z sound good? i think you guys certainly have the expertise to do it.
Hey guys, love the videos. Very interesting and different type of content. Can you build one for an E9X M3? I want to see how close we can get it to a F1 noise or a more exotic tune.
That first one cut right thru me when i heard it...on my phone speaker 🤯
You got a hundred horsepower out of a header tune... That's incredible.. I'm proud of you... I've tried to find all kinds of information.. I've poured over david visard's... He's about the only.
One I will actually listen to... You're on the right path.Don't listen to these people who just want to be egotistical with how they look or how they sound. The real gears are not the drifters.They're the ones who are trying to get to the finish line the fastest.
Great info! Nice work! Hope to see a Jaguar F-Type, that already have a great sound, but there’s always room for improvement.
I’m over here trying to get my R6 to sound like a F1 car. Finally found an original pair of Ti Leo Vince headers. Should help a bit but I need all the sounds haha
Hi OJ loving the technical aspects of exhaust design and learning a lot from you. I did enjoy the first exhaust on the Lamborghini very raw and unique and absolutely beautiful work that needs showing off
What engines to work your magic on? It has to be 5 cylinder the Audi Quattro is my favourite sound of all but very rare in the states. How about a Volvo 5 pot or A Ford focus R/S? Or do you think you could work your magic on a 9000 rpm Honda K20/24?
Keep making these very informative vids. Thanks Phil
Finally ! i knew you guys would make this video
Id love to see what you can do with the sound of a w210 v6!
Both versions sound awesome 😎 this one’s even crazier 😮
Id love to hear a ford 4.6 4v done right. With all the coyote stuff these days, the old 4.6 gets forgotten, and even tho they dont make the power of a coyote, most agree, the 4.6 sounds better!
I agree. I've had 3 Coyotes and they all sounded poo poo in comparison.
I swear they sound just like the old 289.
It's an obsolete engine by today's standards
The analogy to a brass instrument is a good one. For example, french horns have that soft smooth sound because they have tubing that's tapered along its full length, not just at the bell. Similarly the difference between a baritone and euphonium is that tapered tubing. Think of Hans Zimmer horn blats (straight tubing, bass trombone etc) vs. smooth french horn tones like on After The Goldrush by Neil Young. I don't think you're actually hearing a "higher pitch" tone. You're hearing an emphasis of the fundamental. For example that V12 at 8k rpm has a fundamental of 800hz, which is what you hear. To accentuate this further an exhaust could be designed to resonate at that frequency, but that's typically difficult due to the lengths and diameters of the exhaust. So for example a Triton V10 (like that 2v head there) would only have a fundamental of 500hz at 6k rpm. You can also accentuate this by softening the higher harmonics using absorption style mufflers like the typical straight through resonator.
Sounds good 👍