HP and exhaust systems
Thread Starter
Intermediate
Joined: Feb 2008
Posts: 27
Likes: 0
From: Marco Island, Florida
HP and exhaust systems
I have an '08 A6 coupe with the stock NPP exhaust that increased the HP by 6 to 436. Do any of the other exhaust systems (Corsa,etc) add any more HP than that? Thanks.
Melting Slicks
Joined: Mar 2007
Posts: 2,838
Likes: 6
From: San Diego CA
Speaking for myself, I did not consider HP gain, if any, when I installed an aftermarket exhaust. I did for the SOUND. Any HP gain would be a bonus.
Last edited by SanDiegoBert; May 20, 2008 at 06:15 PM.
Burning Brakes
Joined: Oct 2006
Posts: 995
Likes: 2
From: Virginia Beach VA
Not really
Most claim gains, but there nominal. I have Flowmasters, 'til this weekend, going w/ NPP, anyway there is lots of discussion they actually hurt power, but I have only dynoed the car w/ them on w/ minor mods & then w/ cam, FAST, etc. Just curious, why are you asking, you probably have the best setup outhere. Even the guys w/ cutouts on stock motors don't pick up much.
Thread Starter
Intermediate
Joined: Feb 2008
Posts: 27
Likes: 0
From: Marco Island, Florida
Most claim gains, but there nominal. I have Flowmasters, 'til this weekend, going w/ NPP, anyway there is lots of discussion they actually hurt power, but I have only dynoed the car w/ them on w/ minor mods & then w/ cam, FAST, etc. Just curious, why are you asking, you probably have the best setup outhere. Even the guys w/ cutouts on stock motors don't pick up much.
Team Owner
Joined: Jun 2005
Posts: 46,295
Likes: 2,596
From: Northern, VA
St. Jude Donor '15
"In honor of jpee"
very unlikely. the only time a bigger exhaust diameter starts helping is when you have less restrictive headers ahead of them as well as (sometimes) either less restrictive cats, or no cats.
then, you need to add some power to the engine in order to take even more advantage of this now freer breathing exhaust. and that can take the form of supercharging or turbocharging as well as other methods.
by itself, a catback system won't add very much, claims notwithstanding.
then, you need to add some power to the engine in order to take even more advantage of this now freer breathing exhaust. and that can take the form of supercharging or turbocharging as well as other methods.
by itself, a catback system won't add very much, claims notwithstanding.
Burning Brakes
Joined: Oct 2006
Posts: 995
Likes: 2
From: Virginia Beach VA
Just curious, since I see all over the forum guys adding Corsa's and other brands as well as seeing various advertisements. If I remember right the diameter of the NPP is 2.5", the Z06 exhaust is 3" and Corsa is selling 3.5 to 4". Not being a mechanic I was curious if the larger diameter allowed more HP.
1. NPPs are 2.5 inlet w/ 2 3.5 outlets
2. Z06 are 3" inlet w/ 2 3.5 outlets & actually go down to 2.5 the last 1" before the muffler.
3. Corsa for C6 will be 2.5 inlet w/ choice of 3.5 or 4 outlets
4. Corsa for a Z06 will be 3" inlet & same as above.
The inlet size is what matters and all C6 will be 2.5 & all Z06 will be 3, the outlets are purely for looks. That said, there lots more involved in choosing the header primary size, x-pipe, & midpipes. There also is a fair amount of debate. For that info go to tech section & look for "Those who have Kooks longtubes, questions...". I gave my thoughts & others had their comments as well. You'ld do well to take a look at the info simply to educate yourself.
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