Suns_PSD

I want to know if anyone has documented any power gains going to an aftermarket muffler system.

Mike's LS3

Keeping the same pipe diameter, I would not expect any gains over the NPP which bypasses the muffler.

Steve Haefner

Suns_PSD

Corsa claims 13 rwhp.
I was hoping someone had dynoed.

Not So Fast

Does being "louder" count make some think their car is faster
NSF

Suns_PSD

A Sport Corsa is quieter than a NPP when open actually.

I found one dyno test online of the Corsa on a Z06 where it made another 4 rwhp. But that was going from a 3" Bi-mode to another 3", on a car with OEM manifolds.

hippy

I found one dyno test online of the Corsa on a Z06 where it made another 4 rwhp. But that was going from a 3" Bi-mode to another 3", on a car with OEM manifolds.

I could barely notice a 20rwhp gain on my car last summer. Sure hope you are going to buy the exhaust for the sound and not power gain.

Boomer111

I do not know how Corsa claims 13 hp gains with just a can change.

C6David

I changed the npp for corsa xtremes, took the cats off and added a fast manifold and gained 9hp.

So maybe just maybe that $1300 dollars was good for 1-2 of those hp. The sound was worth it though!

Suns_PSD

Thanks for the input. LS2 or LS3?

C6David

This was on a ls3

Suns_PSD

Good date point BUT, the FAST looses power on the LS3 in back to back dyno tests. Cat delete alone doesn't seem worth much for most applications, 0-5 hp.

C6David

Power wasnt my concern track times were and gained 5 tenths and 5mph from those changes.

It did lose 6wtq though lol.

As far as an axle back gaining power from being more free flowing vs npp I doubt it and if it does it would be minimal. I had my npp's v-banded so I could swap out the mufflers for straight pipes at the track and they had no notable gains in stock form. Besides making a lot of noise.

JayplaySS2

There must be some power in them, here is a test I remember from a while back, did a quick search so come to whatever conclusion you want -

I run a Magnaflow single tip myself to save weight, that's something to consider as well-

http://www.lsxtv.com/tech-stories/ex...or-perfection/

0HRE_Jurrian

I know the thread title didn't mention Akrapovic, so hopefully I'm not barging in here, but since your post was more generic towards an 'aftermarket system' I felt that I should at least post this up so you can see. Akrapovic should be the solution if you ask me, but I'd rather let the dyno do the talking.

Just a bit of information - When they test a vehicle do three dyno runs for a baseline and calculate the average, then after the final production system is produced, they dyno the vehicle three times again and get the average of the runs to give us this technical information for the Evolution Line:





The reason why the averages of the three runs are important is because Akrapovic doesn't take the stock dyno that made the least power and match it up against the highest after the exhaust system has been installed to give you inflated numbers. These numbers here are in fact going to represent the least amount of power that you are to expect from this system. Not only that but considering there's also a 40% reduction in weight is nothing to snarl at either, that is a significant amount of weight to loose all while gaining 18.3HP at 5750RPM and 19lb-ft at 4650RPM.

Suns_PSD

Thanks for that post. Those gains are so high that I sincerely have a hard time believing them!

I agree, the Akro is the BEST axle back made. The fact that it drops a lot of weight as well is a big deal to me personally. I also like that they include so much real info about it, how come all of the manufacturers don't do this?

0HRE_Jurrian

- The funny thing is, despite being that high, Akrapovic could have easily fudged numbers, pulled the lowest stock dyno and the highest modified dyno and updated the results, but averaging three runs from stock and three runs from modified limits any abnormalities in the dyno results. Luckily for me seeing Akrapovic's facility in person just this past week, I cannot be more impressed by the details in which they go into for each process.

I will have a full report for everyone on Akrapovic and detail every aspect of the process from R&D to production and so on, but for now if anyone has any questions for me on that, let me know, but I felt it was necessary for me to share those results

jbomx363

Are those dyno numbers against the base or the NPP system?

0HRE_Jurrian

That should be the base system because we wanted an original baseline to work off of.