Corsa X-Pipe

[RICKYRJ1]

Does anybody run an X-Pipe on their Corsa exhaust? I seem to only see B&B with them. Is there no upside? or is there possibly a downside? Is removing the existing resonator and replace with straight pipes produce any gains? Thanks in advance for any and all advise. Rick

[tf95ZR1]

Hi Ricky!

I replaced the Borla resonator on my Borla exhaust system
with a B&B X pipe. I dynoed before and after and gained 25 rwhp.
I like the sound better, not much louder, but yes, drones at about 1800 rpm.

[Paul Workman]

The beauty of the Corsa system is by design. The inherenty designed (Helmholtz) resonator section cancels certain resonant (sound) frequencies and mitigates others as well - without impeding the flow of the exhaust gasses. IOW, the Corsa IS essentially the same as removing the stock resonator and installing straight pipe in its place. So, there wouldn't be any practical (if any) increase in performance by swapping straight pipes for the Corsa resonator section.

As for the X pipe, specific HP improvements in performance depends on what else comprises the exhaust system, e.g., w/ or w/o headers, mufflers used, etc. But, specific quantities aside, the improvements experienced by many before and after users is "all good": up to 25 rwhp is commonly claimed. (YMMV). I have one (from Stainless Works). My fully ported (except for throttle body) motor with LT (SW) headers, 3" exhausts and somewhat restrictive mufflers makes 432 rwhp (before last improvements). How much is due to the X-pipe? I dunno. But, it's part of the package, and I "think" it helps...so it does! ;)

[32valvZ]

Which mufflers you using Paul?

[DRM500RUBYZR-1]

The beauty of the Corsa system is by design. The inherenty designed (Helmholtz) resonator section cancels certain resonant (sound) frequencies and mitigates others as well - without impeding the flow of the exhaust gasses. IOW, the Corsa IS essentially the same as removing the stock resonator and installing straight pipe in its place. So, there wouldn't be any practical (if any) increase in performance by swapping straight pipes for the Corsa resonator section.

As for the X pipe, specific HP improvements in performance depends on what else comprises the exhaust system, e.g., w/ or w/o headers, mufflers used, etc. But, specific quantities aside, the improvements experienced by many before and after users is "all good": up to 25 rwhp is commonly claimed. (YMMV). I have one (from Stainless Works). My fully ported (except for throttle body) motor with LT (SW) headers, 3" exhausts and somewhat restrictive mufflers makes 432 rwhp (before last improvements). How much is due to the X-pipe? I dunno. But, it's part of the package, and I "think" it helps...so it does! ;)

Paul,
B & B has the Helmholtz chambers in the mufflers.
Wouldn't having them in either place address the resonance?
Does Corsa have them in both the mufflers and the resonator?
If one does the job why have more?

25 added HP from the x pipe is astounding!
That rivals many an internal mod.
I guess I will finally install my other B&B Fusion system with the x-pipe that have been sitting on the boxes since 2014.
Marty

[32valvZ]

I noticed a definite seat of the pants improvement going from the regular exhaust configuration and sizes, to all 3" with X pipe and mufflers (all SW). Sounds great too... Yes on drone... I dont mind it though.

https://www.lmperformance.com/662816/zr1s-stainless-works-chevy-corvette-exhaust-3-aggressive-sound-with-x-pipe.html

[secondchance]

Paul,
B & B has the Helmholtz chambers in the mufflers.
Wouldn't having them in either place address the resonance?
Does Corsa have them in both the mufflers and the resonator?
If one does the job why have more?

25 added HP from the x pipe is astounding!
That rivals many an internal mod.
I guess I will finally install my other B&B Fusion system with the x-pipe that have been sitting on the boxes since 2014.
Marty

Marty,

My understanding is that resonators and mufflers address different frequency range. Resonators are low frequency and higher frequency handled by the mufflers. At least, above is my understanding.
Introducing X pipe, I think, complicates the issue.
Any acoustic engineer out there?

[RICKYRJ1]

I dont mind adding more noise for more HP. Car currently has a Haibeck 500 hp pkg. Corsa exhaust no cats. She runs great as is but always looking for more.

[secondchance]

I dont mind adding more noise for more HP. Car currently has a Haibeck 500 hp pkg. Corsa exhaust no cats. She runs great as is but always looking for more.

Hi Ricky!

Drone is not exactly extra loud noise. It's similar to standing in front of a large subwoofer. It's a low frequency vibration that goes through your body. I was getting nauseated by this when I experienced it.

[Paul Workman]

Paul,
B & B has the Helmholtz chambers in the mufflers.
Wouldn't having them in either place address the resonance?
Does Corsa have them in both the mufflers and the resonator?
If one does the job why have more?

25 added HP from the x pipe is astounding!
That rivals many an internal mod.
I guess I will finally install my other B&B Fusion system with the x-pipe that have been sitting on the boxes since 2014.
Marty

Yes, the Corsa has them (Helmhotz) in BOTH the resonator section AND the mufflers - both designed to work in tandem in order to cover the widest range of resonant frequencies.

[Paul Workman]

Which mufflers you using Paul?

Currently, I'm unfortunately saddled with some Magnaflow dual outlet mufflers. They don't eliminate drone, but do mitigate it somewhat. At issue is the fact that the 3" inlet necks down to approx 2-1/4".:mad:

Following the example of others (e.g., Bob Banks for one) I may keep them, but install a pair of cutouts ahead of the mufflers with a switch in the console(?). (I'd be interested to see what my HP would be with cutouts AND after porting the TB to 63mm. Last time dyno'ed it was 432 @ the wheels. Anything around 440 to 445 rwhp w/ stock cams would put a big smile on my face!

[Paul Workman]

Paul,
B & B has the Helmholtz chambers in the mufflers.
Wouldn't having them in either place address the resonance?
Does Corsa have them in both the mufflers and the resonator?
If one does the job why have more?

25 added HP from the x pipe is astounding!
That rivals many an internal mod.
I guess I will finally install my other B&B Fusion system with the x-pipe that have been sitting on the boxes since 2014.
Marty

Astounding, yes. But, the caveat is 1) that data is NOT from personal 'before n after' experience, and 2) 25 HP was stated by one of our own w/o any other information as to other mods that may or may not have also been incorporated. And, the improvement might also depend on engine displacement. (I'd be interested to see any data that SW or B&B has on them, far as before and after goes.)

[We Gone]

Hope I don't get flamed for this but....I can see a 25hp gain from a complete exhaust change but just an X-pipe? and 25RWHP ?

[DRM500RUBYZR-1]

The B&B X-Pipe looks so darn good it could win a beauty contest.
Compared to the B&B Resonator, which was worlds better than stock, this X-Pipe is a highly polished smooth 3" beauty that certainly LOOKS like it could add Horsepower, but even if it could not, it will go on for looks alone.

Drone.

I would imagine some are truly bothered by it, such as "second chance".
I don't doubt him for a minute.
However most people are not sickened by it, just bothered by it.
I run no mufflers, so I cannot hear the drone.:mrgreen:
I have always found the deep toned systems more to my liking, but that is a personal thing. Grew up surrounded by Thrush Glass packs, plus I am losing hearing form driving too many sidepipe Big Blocks, and one FEROCIOUS Cobra.

So yes, eliminating drone for some is a must.
For me it is rather irrelevant, as the noise drowns out the drone!

Sometimes however, it would be nice to converse with the occasional passenger without having to scream.
So, Fusion is it for me, but since I am adding mufflers, I will indeed be deleting the Resonator in favor of that gorgeous X -Pipe!

Call me crazy, but you will need to call me LOUDLY if you want me to hear you, but I will be smiling!
:cheers:
Marty

[ABBEZR1]

The B&B X-Pipe looks so darn good it could win a beauty contest.
Compared to the B&B Resonator, which was worlds better than stock, this X-Pipe is a highly polished smooth 3" beauty that certainly LOOKS like it could add Horsepower, but even if it could not, it will go on for looks alone.

Drone.

I would imagine some are truly bothered by it, such as "second chance".
I don't doubt him for a minute.
However most people are not sickened by it, just bothered by it.
I run no mufflers, so I cannot hear the drone.:mrgreen:
I have always found the deep toned systems more to my liking, but that is a personal thing. Grew up surrounded by Thrush Glass packs, plus I am losing hearing form driving too many sidepipe Big Blocks, and one FEROCIOUS Cobra.

So yes, eliminating drone for some is a must.
For me it is rather irrelevant, as the noise drowns out the drone!

Sometimes however, it would be nice to converse with the occasional passenger without having to scream.
So, Fusion is it for me, but since I am adding mufflers, I will indeed be deleting the Resonator in favor of that gorgeous X -Pipe!

Call me crazy, but you will need to call me LOUDLY if you want me to hear you, but I will be smiling!
:cheers:
Marty
I have a B&B system with a resonator and would like a x-pipe but can't find one anywhere...I've only seen them here used and have been beat to the punch.. Any idea's where to purchase new?


Thanks,

[DRM500RUBYZR-1]

Reach out to B&B directly, or Southern Car Parts who is their largest distributor.
Marty

[ABBEZR1]

Reach out to B&B directly, or Southern Car Parts who is their largest distributor.
Marty

Thanks, I will try to call them...When I purchased mine new a few years back B&B sent me to a distributor but they didn't offer the x-pipe...I will reach out to them again..


Thanks!!


Steve

[Pete]

We also gained 19 RWHP replacing B&B resonator with X-pipe.

Pete

[We Gone]

So any information on gain to a corsa system?

[Pete]

Corsa has an H-pipe with 2 bullit like resonators.
I think Corsa could benefit from an X-pipe.

I have tested Corsa against a free flowing full 3" exhaust x-pipe and Dynomax mufflers on a fully ported w/cams 350ci LT5
Corsa 428 RWHP
Full 3"exhaust x-pipe & Dynomax 445RWHP
Same dyno same day.

Pete





So any information on gain to a corsa system?

[tf95ZR1]

Sorry Gents, I should have been more clear in my post #2.
I don't think my 25 HP gain was necessarily from the B&B
X-pipe, but more from removing the Borla resonator.
Mark H agrees that it's a HP robber.

Why I didn't just go with straight pipes? I believe the X-pipe
cancels out some of the sound waves and if it is straight
enough, doesn't restrict the exhaust very much. I do not
have any straight vrs. X-pipe HP (or sound) data for my system.

[max76]

In my 90 zr1 i have a B&B 3" exhaust, i hand made a steel H pipe...now i have the correct sound i like...Yes at 1800/2000 rpm i have little drone....but at idle it's very very nice

[We Gone]

Pete, Not trying to get to far off track just understand how the gains in HP are so great.

Great information, it leads me to a couple of other questions regarding exhaust systems.

1. Is the gain in HP also a result of the 3" pipes over the Corsa 2.5"

2. How does the pipe diameter effect HP & torque. I always thought as the diameter of the pipes went up you could stand a chance to lose torque, or the gains were only HP with no = gain in torque.

Thanks.

[Pete]

The Corsa muffler has 1 outlet at the muffler 2 1/4".

Need to have correct size for the maximum performance across the board.
Some do not choose exhaust for max performance but rather for sound.

https://www.youtube.com/watch?v=O1bXPNy1Yn4

Pete



Pete, Not trying to get to far off track just understand how the gains in HP are so great.

Great information, it leads me to a couple of other questions regarding exhaust systems.

1. Is the gain in HP also a result of the 3" pipes over the Corsa 2.5"

2. How does the pipe diameter effect HP & torque. I always thought as the diameter of the pipes went up you could stand a chance to lose torque, or the gains were only HP with no = gain in torque.

Thanks.

[Jagdpanzer]

Which exhaust system available in today market has the highest flow capacity, with and without cutouts? I have a 2.5” Corsa system on now behind the 427 but the beast wants more flow capacity. Are there any high flowing 3” systems out there that are drone free at cruising speed like the Corsa system?


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[HAWAIIZR-1]

Which exhaust system available in today market has the highest flow capacity, with and without cutouts? I have a 2.5” Corsa system on now behind the 427 but the beast wants more flow capacity. Are there any high flowing 3” systems out there that are drone free at cruising speed like the Corsa system?


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Hey Phil,

I’m not sure, but I thought only the BBE Fusion? I know a couple folks here have it and hopefully will chime in. If I were in the market this is the one I would buy.

https://www.bbexhaust.com/shop/chevy-c4-corvette-zr1-fusion-cat-back-exhaust-fcor-0011/



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[Top Toy]

Latest version of the B&B Fusions are mimimum back pressure, terrific sound and no drone. Love 'em!

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[Karl]

2.5" vs 3.0" exhaust on the Dyno.

https://youtu.be/_PVXvHkr-Vs

[Mystic ZR-1]

That’s on a 454, how about a 350, less volume to start with?

[Jagdpanzer]

Thanks Guys
I’ll look into the BBE Fusions

[BigJohn]

The 454 would fit in your car 🚙 and save the LT5 for when you are ready to sale your car in an other twenty five years!

[Pete]

That’s on a 454, how about a 350, less volume to start with?

It does not matter the CI if they are making same power.
The 454 peaked at 6100 where as a modded 350 LT5 peaks at 6700+ RPM.

Pete

[XfireZ51]

Which exhaust system available in today market has the highest flow capacity, with and without cutouts? I have a 2.5” Corsa system on now behind the 427 but the beast wants more flow capacity. Are there any high flowing 3” systems out there that are drone free at cruising speed like the Corsa system?


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Phil,

IIRC ur running 4.10s w 19” in back. So cruise at about 75-80mph is coming in at 1900-2100rpm. Same as mine is currently. Part of taming drone has to do w the tune itself. The better and more spot on it is, the sweeter the exhaust note. The richer the tune, the more likely u’ll have drone especially as MAP increases, ie inclines. Which is why I like to tune the cruising areas of the VE tables just just slightly lean, say a 130-131 BLM.
My exhaust consists of 1 7/8” coated Watsons, w 3” ID pipe into
Stainless Works X-pipe(no bafflling), then into 3”ID DynoMax Ultraflo dual outlet mufflers topped off w C6Z06 NPP tips(thx Al)Normally run w one outlet switched to Closed.

[-=Jeff=-]

I will also add is that Drone is relative.. what some might not hear or feel as drone, might affect others.. I had Corsa on my 1990 with headers and cats, there was no drone, but at WOT I did not like it.. cruising around was much better (to me). Now I have a Stock LT4 system behind my Headers and Cats. if I were to change anything I would swap out the mufflers, but the LT4 system is the Highest flow stock C4 system out there. I am finally at the point where I am just leaving it alone

[Gunny]

I will also add is that Drone is relative.. what some might not hear or feel as drone, might affect others.. I had Corsa on my 1990 with headers and cats, there was no drone, but at WOT I did not like it.. cruising around was much better (to me). Now I have a Stock LT4 system behind my Headers and Cats. if I were to change anything I would swap out the mufflers, but the LT4 system is the Highest flow stock C4 system out there. I am finally at the point where I am just leaving it alone

My findings as well ... I tried at least 5 systems before deciding the LT4 was best for me. I installed QTP cutouts that dumped just before the stock mufflers. The cutouts were variable from open to closed and when wide open the HP increase was close to 20 HP on the dyno. Totally closed on the LT5 (ported, headers, no cats) the sound was better than stock and could easily be "sweetened" up by partially opening each cutout to taste, all the while with absolutely no resonance. Not counting all the after market systems I bought this mod was actually the best bang for the buck exhaust mod possible that achieved my goal of sound, performance, and no resonance. I'm fairly certain that my cost was less than $500 for the system.

[-=Jeff=-]

Funny you have pictures of the cutouts installed on your system?

[Gunny]

Yes, but need to find them.

[-=Jeff=-]

Yes, but need to find them.

Whenever.. Curious, not that I will get to it anytime soon.. but I like the idea

[Gunny]

Whenever.. Curious, not that I will get to it anytime soon.. but I like the idea

Since you already like the LT4 exhaust I think you will really like/appreciate the addition of QTP's to your exhaust. Extremely versatile, they add a whole different dimension to the system. LINK (https://quicktimeperformance.com) to QTP

Cut-Out Pics
http://www.zr1.net/forum/picture.php?albumid=472&pictureid=4320

http://www.zr1.net/forum/picture.php?albumid=472&pictureid=4317 http://www.zr1.net/forum/picture.php?albumid=472&pictureid=4316

http://www.zr1.net/forum/picture.php?albumid=472&pictureid=4315 http://www.zr1.net/forum/picture.php?albumid=472&pictureid=4314

http://www.zr1.net/forum/picture.php?albumid=472&pictureid=4313 http://www.zr1.net/forum/picture.php?albumid=472&pictureid=4312

[WARP TEN]

Since you already like the LT4 exhaust I think you will really like/appreciate the addition of QTP's to your exhaust. Extremely versatile, they add a whole different dimension to the system. LINK (https://quicktimeperformance.com) to QTP

Cut-Out Pics
http://www.zr1.net/forum/picture.php?albumid=472&pictureid=4320

http://www.zr1.net/forum/picture.php?albumid=472&pictureid=4317 http://www.zr1.net/forum/picture.php?albumid=472&pictureid=4316

http://www.zr1.net/forum/picture.php?albumid=472&pictureid=4315 http://www.zr1.net/forum/picture.php?albumid=472&pictureid=4314

http://www.zr1.net/forum/picture.php?albumid=472&pictureid=4313 http://www.zr1.net/forum/picture.php?albumid=472&pictureid=4312

As you might imagine, Gunny, I certainly second your thoughts. And you did a nice installation, which I had not seen before. Good work!--Bob

[-=Jeff=-]

I am liking that but man those QTP controller are pricey

[Gunny]

I am liking that but man those QTP controller are pricey

I thought the exact same thing ... but, for me, it was worth it.

[Paul Workman]

Marc has a quick disconnect flange (manual) arrangement for his mufflers so he can remove the muffs at the drag strip. That has the added benefit of weight reduction prior to racing, but IIRC he also has tuned his calibration for peak performance w/o the mufflers installed. The latter is worth a moment of consideration before installing the cut-outs if max performance is the goal.

Just a though...;)

[WARP TEN]

Marc has a quick disconnect flange (manual) arrangement for his mufflers so he can remove the muffs at the drag strip. That has the added benefit of weight reduction prior to racing, but IIRC he also has tuned his calibration for peak performance w/o the mufflers installed. The latter is worth a moment of consideration before installing the cut-outs if max performance is the goal.

Just a though...;)

He has also said that taking the mufflers off is a pain and if he was going to do it again he would probably use cutouts. but either way, cutouts in front of the mufflers or simply no mufflers provide about the same HP gains. the stock mufflers are big bottlenecks. --Bob

[Gunny]

... the stock mufflers are big bottlenecks. --Bob
about 20hp (at the wheel) ... after Marc ported my 90 he ran before/after dynos to see what the difference was

[5ABI VT]

Corsa can do a 3" system with an X pipe or 2 of them.. but they know they wont sell many systems unless we do a group buy. they told me They would consider it if I could get 25 people.. might be tough. Had the Corsa system on my 5.0 coyote Mustang. FUll 3 " dual x pipes and straight through cans. 0 resonance or drone anywhere and was a beautiful system I don't see why they couldn't make one similar for the LT5.