Like Chris said numbers are fun to talk about, but if the usable power comes in low and climbs steady, it feels faster even if your giving up a few HP, and feeling power throughout the gears is tits compared to a 3500 4500rpm high hp number, it must be the 42 years of experience...D&D makes some nice exhaust also.
I love the way you work. You are experts on doing what you are doing. But mostly I love the way you get along with each other. Keep up the great work, performance, friends and great vives at work. You all guys are pros.
Thanks for all the hard work you have done to show the difference in each pipe. Mine is on order with you and waiting on delivery for my 24 Low Rider ST
Interesting test; my gut instinct says that the main difference in power was the Thrashin system being held back by the dogball resonator. It's my understanding that the resonator gets rid of the classic empty pipe "rooga rooga/hub blub blub" sound upon deceleration that your new setup now has. 🤜
The only problem I see with HPI is the lead time. They're like 16-20 weeks out. I think they are the best but damn 16-20 week wait and +$300 for 3 or 4 horsepower? Is it worth it? Your call.
@@markclay4598 I’ve got the Sawiki shorty on my bike and it’s freaking awesome! Side note: my bike isn’t a Harley nor an import. I’ve got a couple videos of it on my channel so far
In general, the exhaust system is designed to minimize back pressure. At the same time, the pipe diameter and length are carefully balanced with the engine performance. This is done to generate the right gas flow rate that assists in engine scavenging.Basically, back pressure is a function of the length and diameter of the exhaust system. While reducing back pressure is necessary, you also want the exhaust gases to have a minimum velocity. When the exhaust valve opens a high-speed positive pressure wave exits the cylinder and drags the exhaust gases with it. This wave travels at a certain velocity, they leave a low-pressure zone behind them. The low pressure helps in creating a suction effect. As a result, evacuating the engine chamber from the burnt gases gets easier. The entire process is termed inertial scavenging.
Dunno if you’re aware. But Thrashin have a tailpipe without the dog balls. If this comparison should have made any sense you should have compared similar baffles. Actually it’s amazing how close the dog balls Thrashin version is to the HP one. Anyways. Love your shit! Keep at it 🤙🏼
Hell Yea BlockHead & Chris really enjoyed this video. Extremely well put together. I mean when you first cranked the HP exhaust, 😍Nasty. BlockHead if you have a moment how well do you think the Vance & Hines Hi-Oput RR numbers could be ? Or is it to many variables to tell?
Dude I would love this bike in my garage. I bought a 2020 fatboy with the M8 but I shoukdve bought the lowrider st. Absolutely love this bike. Thanks for the video!!
If it's not for science, is it even worth doing? I look forward to future science videos! Great vid, keep up the great work; it's thanks to your channel that i've settled on picking up a Harley for my next bike, and these science videos have really helped educate me on the best parts to look at.
For sub 2 grand for a pipe , it better perform..., so in other words their both great exhausts for the m8, but stupid expensive...I'll stick with my bassani stainless 2 into 1. Great video tho guys, love what you all are doing.
I just put a Vance&Hines upsweep on my 2022 Fxlrs. Have you guys ever had a build with the upsweep? Do they make power? It’s not a high dollar piece but it seems too be very quality. I love the sound it stands alone compared to what everyone else is throwing on there lowriders
Can’t beat HPI as far as build quality and how light they are. They make great power too. I love the 3 piece construction. You can pull the pipe off to clean it in less than 10 minutes. No one touches them in quality.
I've been thinking about getting on the waiting(drooling) list to order an HPi pipe for my Lowrider ST. But, because the wait was so long, I jumped on a smoking deal for a new Bassani 2into1 (Blem) pipe. I'd be interested in seeing the numbers for it(Bassani), in comparison to the D&D (and HPi/Thrashin). The Bassani is pretty popular pipe and I think you should include it in the shootout.
Can you guys please do some twin cam stuff ? I exhaust shoot out / cams etc … I want the Block Head opinion and not all of us can afford a new bike ! Thanks Fellas
If enough people pay in advance for an upgrade, Harley will make them. Personally I think some of the markup is because other cat delete options are also expensive and don’t provide as much of a performance upgrade. Just an idea, but HD didn’t invent that game. But I’m glad my new bike is a turn of the century Triumph triple liter bike. Faster than you think for reasons I think I will take to the strip. But stock quarter is 11 flat. And no electric nannies. I need to feel my bike. And I feel the need…but that HPI setup sounds really good.
I had a slight feeling about this outcome, but it’s good to be validated. Personally, I think the D&D is going to beat all of them, but I’m not a fan of the looks. 🤷🏽♂️
Very nice piece of equipment. Looks great, sounds great, creates some extra HP at a premium price. I like that. As far as the O2 sensor goes, can’t the shop install a bung at the desired location and simply leave the poorly placed one plugged?
Can y’all do a review of the Triumph Bonneville Bobbers. Recently discovered Thornton Hundred and their amazing work on those classic bikes. Curious what y’all’s opinions of them are.
How warm does that HPI exhaust get without heat shields? I have the Fuel Moto stainless without heat shields and gets quite hot! Wondering if it even makes a difference at all. Thanks.
I’d like to see a DnD exhaust comparison on the dyno. DnD pipe is roughly about $900 dollars. I would like to know if you guys are also getting paid by HPI Thanks
You do great OBJECTIVE studies vs SUBJECTIVE studies on performance. Dyno best way to show. If a bike makes 3000 horsepower at 20,000 rpm who wants to ride that around town.
Thanks for the great video. I'm buying an ST soon, so I'm trying to decide on the right pipe. Did you measure the HP/torque on the stock bike? How do the HPi/Thrasher numbers compare to stock?
Sheeeeesh, that sounds *GOOD!* Both sound awesome, and stoked to see more from Horsepower in the episodes. Looking forward to the giveaway of this bike! Fingers crossed that I get lucky 😆
Question, would you consider doing the 68 mm throttle body with that set up, or do you think it would open it up too much compared to the 64 mm throttle body?
In general, the term backpressure Is misleading. You need the baffles in the exhaust system to scavenge exhaust gases or reversion will occur. The term backpressure to the uninitiated sounds as if you need to block the exhaust for more power.
How do I get one of those pipes and how will it work with my build? I have a fueling racing cam plate words 22 Xe cam and I’m ditching the Harley tuner for a Dyno
Ya I have a el diablo from cobra. It under 700. Deffinetly better than stock. Even with a canned tune from fuelmoto. Also Better than s&e slip on super trap and duals with and without d.k torque inserts. I did have to fatten it up at 0% trottle to get rid of decel pop thoe. Ide be curious to see it vs a stealth or the 2 they are testing. But... I also have a twin cam
anyone have any experience with the Rinehart 2 into 1 exhausts? not the slip ons. I'm trying to find a balance of performance, budget and nothing too loud
![[#2024MAMA] ROSÉ (로제), Bruno Mars - APT. | Mnet 241122 방송](http://i.ytimg.com/vi/dgGqD28J6aQ/mqdefault.jpg)
These "tech" vids are the best. Sick's explanations and experience deserve to be continuously HEARD.
Great garage Block, enjoy being here.
Anybody that likes to do their own work has to love you guys. Great information for all of us. Appreciate the work you do to help keep us informed.
Like Chris said numbers are fun to talk about, but if the usable power comes in low and climbs steady, it feels faster even if your giving up a few HP, and feeling power throughout the gears is tits compared to a 3500 4500rpm high hp number, it must be the 42 years of experience...D&D makes some nice exhaust also.
I love the way you work. You are experts on doing what you are doing. But mostly I love the way you get along with each other. Keep up the great work, performance, friends and great vives at work. You all guys are pros.
Riding, motor cycle life~ 🌞
If you raise your hand, 👋, it's even more nice to meet you. It's safer. It's more honest.
Always be happy with you.👏👏
I’m actually anxious to see the D&D pipe numbers. I so appreciate the science research your doing 😁.
I'll second that they are great.
IMO, DND does some great pipes for half the cost of HPI‼️🤣
Would absolutely love to see a D&D fat cat and the new super bike pipe from Bassani!
I would like to see a fab28 pipe as well.
Same. I’m interested in seeing the numbers on the Ft. Worth, TX based D&D as well.
What about a thunderheader? I love the sound and performance on my old evo.
Thanks for all the hard work you have done to show the difference in each pipe. Mine is on order with you and waiting on delivery for my 24 Low Rider ST
I'm in California and I'm amazed at how far the grumble is with this pipe it pumps louder than I thought it would be allowed to
Interesting test; my gut instinct says that the main difference in power was the Thrashin system being held back by the dogball resonator. It's my understanding that the resonator gets rid of the classic empty pipe "rooga rooga/hub blub blub" sound upon deceleration that your new setup now has. 🤜
The only problem I see with HPI is the lead time. They're like 16-20 weeks out. I think they are the best but damn 16-20 week wait and +$300 for 3 or 4 horsepower? Is it worth it? Your call.
That HPI sounds siiiiiiiick.
Iv'e got the mid length stainless steel 2 in one Bassani on my 2020 SGS and it's awesome.
I'm looking forward to the D&D pulls. I'm also interested in the Sawicki. Thanks boyz!
That's 2 for the Sawicki!
@@markclay4598 I’ve got the Sawiki shorty on my bike and it’s freaking awesome! Side note: my bike isn’t a Harley nor an import. I’ve got a couple videos of it on my channel so far
In general, the exhaust system is designed to minimize back pressure. At the same time, the pipe diameter and length are carefully balanced with the engine performance. This is done to generate the right gas flow rate that assists in engine scavenging.Basically, back pressure is a function of the length and diameter of the exhaust system. While reducing back pressure is necessary, you also want the exhaust gases to have a minimum velocity.
When the exhaust valve opens a high-speed positive pressure wave exits the cylinder and drags the exhaust gases with it. This wave travels at a certain velocity, they leave a low-pressure zone behind them.
The low pressure helps in creating a suction effect. As a result, evacuating the engine chamber from the burnt gases gets easier. The entire process is termed inertial scavenging.
Not back pressure, boomer.
@@FRWD_FXLRSTelaborate
Dunno if you’re aware. But Thrashin have a tailpipe without the dog balls. If this comparison should have made any sense you should have compared similar baffles. Actually it’s amazing how close the dog balls Thrashin version is to the HP one.
Anyways. Love your shit! Keep at it 🤙🏼
Hell Yea BlockHead & Chris really enjoyed this video. Extremely well put together. I mean when you first cranked the HP exhaust, 😍Nasty.
BlockHead if you have a moment how well do you think the Vance & Hines Hi-Oput RR numbers could be ? Or is it to many variables to tell?
Dude I would love this bike in my garage. I bought a 2020 fatboy with the M8 but I shoukdve bought the lowrider st. Absolutely love this bike. Thanks for the video!!
Exactly the content I’m looking for. Would be nice to see a fab28 thrown into the mix for good measure 🙌
Cam and exhaust shoot out!! Please for Science!! I would love to know what Woods cam 22xe vs 22xd does?!! Love the HPI sounds a lot better
This fucking motorcycle shop is god damn AMAZING! They did an amazing job on my 2023 HD ST. Wow, she's a beast! Love her and Chris is one solid dude!
Baffles me how expensive headers are for bikes…… flat out ridiculous compared to cars
Love my bike, but the quest for power out of these air cooled HD’s is a money grab.
@@freebehindbars8654 I learn new things about my bike every day! Had no clue the radiator was on,y for aesthetics.
Yes. For sure. But car ones rarely get seen. So they have to take extra care making them look good
No pun intended 🤣🤣
@@Chumbucketsecret Who told you that? The radiator on M8’s cools oil that goes to the heads.
I'd like to see the Dyno results for the new Bassani 2:1 SuperBike System. Drag part# 1800-2556
For sure. I just put that pipe on mine.
If it's not for science, is it even worth doing? I look forward to future science videos! Great vid, keep up the great work; it's thanks to your channel that i've settled on picking up a Harley for my next bike, and these science videos have really helped educate me on the best parts to look at.
would be curious about the Trask and Fab28 pipes as well, great vid!!!
For sub 2 grand for a pipe , it better perform..., so in other words their both great exhausts for the m8, but stupid expensive...I'll stick with my bassani stainless 2 into 1. Great video tho guys, love what you all are doing.
Love the Thrashin pipe but the HPI does look damn good on the ST
Black thrashing pipe looks way sick too man, stainless is getting worn out.....everyone is using them
I’ve got the cobra 2-1 sounds pretty good and the added horses is noticeable
Súper dope exhaust. Can’t wait to work with you guys really soon. Great groups of guys with a lot of experience.
Great video. Do you recommend this pipe above all the alternatives out there for performance?? Do they require a spacer for the right side controls?
Great work guys keep the great science “content” rolling. Looking forward to the d&d exhaust
I just put a Vance&Hines upsweep on my 2022 Fxlrs. Have you guys ever had a build with the upsweep? Do they make power? It’s not a high dollar piece but it seems too be very quality. I love the sound it stands alone compared to what everyone else is throwing on there lowriders
Can’t beat HPI as far as build quality and how light they are. They make great power too. I love the 3 piece construction. You can pull the pipe off to clean it in less than 10 minutes. No one touches them in quality.
Check out Stealth exhaust pipes. Kruesi originals channel.. look at the build playlist.
BAMF pipes 💯
@@ianloyd6384 half of them the mufflers droop downwards
What do you think of adding torque cones?
That Harley Davidson Low Rider ST is awesome , BADASS looking bike.
That pipe sounds and performs like premium. Is the TAB slip on muffler bang for the buck? any ideas would be helpful.
I've been thinking about getting on the waiting(drooling) list to order an HPi pipe for my Lowrider ST. But, because the wait was so long, I jumped on a smoking deal for a new Bassani 2into1 (Blem) pipe. I'd be interested in seeing the numbers for it(Bassani), in comparison to the D&D (and HPi/Thrashin). The Bassani is pretty popular pipe and I think you should include it in the shootout.
Thrashin pipes are made by bassani
Can you guys please do some twin cam stuff ? I exhaust shoot out / cams etc … I want the Block Head opinion and not all of us can afford a new bike ! Thanks Fellas
Could you guys test a sawicki on the ST?
Can't wait to see the D&D video, just hoping it's of their bobcat 2 into 1
I freaking love these videos man. Blockhead you got the best channel on youtube!!!
I would like to see how the s&s super street with cat compairs to it , i just got it but i cant find any thing on line
You should get a decibel meter for the dyno room when doing comparisons.
Do you guys have any comparisons or dyno tunes with a thunderheader exhaust on the M8's.
I much prefer the black exhaust look on that bike. I still loved the video and thanks for sharing!
On a 2020 Heritage with a 468 cam I've gotten good results with Rinehart 2,-1 110/125
I would like to see Tab performance Zombie Slipons on the dyno. Im curious how much better the $1800 pipe is
I knew it! Wonder if the differentiator in numbers is the baffles?
@Blockead Check out Stealth exhaust pipes. Give a look @Kruesi originals channel.. look at the build playlists.
BAMF pipes too 💯
Really like the exhaust pipe shootout HPi awesome looking and performing pipes !!!!
Could you do an exhaust shootout on the SP Concepts big bore exhaust as well?
If enough people pay in advance for an upgrade, Harley will make them.
Personally I think some of the markup is because other cat delete options are also expensive and don’t provide as much of a performance upgrade. Just an idea, but HD didn’t invent that game.
But I’m glad my new bike is a turn of the century Triumph triple liter bike. Faster than you think for reasons I think I will take to the strip. But stock quarter is 11 flat. And no electric nannies. I need to feel my bike. And I feel the need…but that HPI setup sounds really good.
Super sick!! Love that exhaust!!
That exhaust looks and sounds sweet!
Shop lookin good man. I hope I can visit next spring 🤙🏻
Thunderheader over all!
Let’s not
Forget thunder header .
I had a slight feeling about this outcome, but it’s good to be validated. Personally, I think the D&D is going to beat all of them, but I’m not a fan of the looks. 🤷🏽♂️
Sick exhaust! I'd say keep it on the bike
Try the new S&S Diamondback Exhaust!!!
Very nice piece of equipment. Looks great, sounds great, creates some extra HP at a premium price. I like that. As far as the O2 sensor goes, can’t the shop install a bung at the desired location and simply leave the poorly placed one plugged?
D&D bobcat vs Bassani road rage mid length shootout? For science… obviously
Second that
Love to see you do a bassani road rage 3 aswell 👌
It’s crazy to see the color of the pipe change that fast. @12:40
I thought that was shade tree there for a moment when you turned the camera I wasn't ready 🤣
awesome video as always , your science research is pretty cool even though it gives you guys a reason to FK off afterwards it's a blessing 👍
Can y’all do a review of the Triumph Bonneville Bobbers. Recently discovered Thornton Hundred and their amazing work on those classic bikes. Curious what y’all’s opinions of them are.
Best exhaust is relative. I will always choose to leave a little horsepower and torque on the table for the sound that motivates me to ride.
Excluding the 2 into 1, which works best on a Milwaukee 8? A 2 into 2 or a 2 into 1 into 2?
I am late on this one but the bassani super bike pipe would be fun to see as well
Great content as usual, but ill stick to my bassarni stage three!!!! just saying..:)
I like the looks of the Trashin pipe better, but the HPI sounds better.
Is there a plan in the future to do the S&S Superstreet? I would love to see how it compares to the rest with a proper tune.
All I want is a header that allows me to have the clearance needed for wide band sensors, after installing a thunder max.
What are anti-revolution chambers and what are they used for, and how do they work? 3:37
How warm does that HPI exhaust get without heat shields? I have the Fuel Moto stainless without heat shields and gets quite hot! Wondering if it even makes a difference at all. Thanks.
I’m thinking about the woods 22xe cam for mine .. haven’t decided yet on exhaust
I'm surprised the HPI made more on the bottom end. I've been testing different baffles on my s&s superstreet.
Have you tested the FuelMoto insert?
I’d like to see a DnD exhaust comparison on the dyno. DnD pipe is roughly about $900 dollars. I would like to know if you guys are also getting paid by HPI
Thanks
Are they doing a black version?
would love to see tou guys try an spc exhaust. I have seen them on the low rider st. as well as other m8 bikes
Im super curious about the SPC pipes.
@@Dexatron I'm waiting on one now for a sporty. I've seen them on the new law rider st , and m8's . they look and sound really good.
@@pics-by-pete maybe post some videos of it when your done
@@Dexatron will do.
You do great OBJECTIVE studies vs SUBJECTIVE studies on performance. Dyno best way to show. If a bike makes 3000 horsepower at 20,000 rpm who wants to ride that around town.
Tucker Speed 🤙🏼
Thanks for the great video. I'm buying an ST soon, so I'm trying to decide on the right pipe. Did you measure the HP/torque on the stock bike? How do the HPi/Thrasher numbers compare to stock?
Sheeeeesh, that sounds *GOOD!* Both sound awesome, and stoked to see more from Horsepower in the episodes. Looking forward to the giveaway of this bike! Fingers crossed that I get lucky 😆
Definitely like the look of the HPi pipe on the bike better then the thrashin.
How the heck did you guys get the black Thrashin'? They only show stainless on their website.
Question, would you consider doing the 68 mm throttle body with that set up, or do you think it would open it up too much compared to the 64 mm throttle body?
In general, the term backpressure
Is misleading. You need the baffles in the exhaust system to scavenge exhaust gases or reversion will occur. The term backpressure to the uninitiated sounds as if you need to block the exhaust for more power.
Honestly. I did buy the heck out of the motorcycle things shirt. On site… literally on sight
Does this exhaust science apply to twin cam bikes? Or strictly Milwaukie 8 bikes?
What about Bassani RR 2 into 1
How do I get one of those pipes and how will it work with my build? I have a fueling racing cam plate words 22 Xe cam and I’m ditching the Harley tuner for a Dyno
Did you compare the stock headers with a decent slip on as well... i've read the torque numbers might be similar to a 2 into 1
I’d like to see a shootout between an expensive exhaust and a lowest price exhaust.
or a hi low build like donut media
Ya I have a el diablo from cobra. It under 700.
Deffinetly better than stock. Even with a canned tune from fuelmoto.
Also Better than s&e slip on super trap and duals with and without d.k torque inserts.
I did have to fatten it up at 0% trottle to get rid of decel pop thoe.
Ide be curious to see it vs a stealth or the 2 they are testing. But... I also have a twin cam
If you're going to do a show down of exhaust throw a bassini road rage 2 in the mix.
anyone have any experience with the Rinehart 2 into 1 exhausts? not the slip ons. I'm trying to find a balance of performance, budget and nothing too loud
Looking to do a 128 kit but want to keep my Reinhardt slimlines Will that be a problem
How would that make my 114 Harley Davidson that I got 2000 heritage classic 114 would that make it run any better
How do the other 2 into 1s compare to the tbr turn out? I really like the tbr you got on yours.