exhaust cut outs
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Joined: Jun 2006
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From: jamestown N.C>
exhaust cut outs
I searched but could not find, is there any hp gain to speak of by installing exhaust cut outs on a mostly stock c5 for occasional 1/4 mile runs? I was thinking that might be the best way of freeing up exhaust when needed then stock exh. during normal driving. thanks for anyone who has done this...
Burning Brakes
Joined: Aug 2006
Posts: 753
Likes: 2
From: Denville NJ
I did that on my '96 Camaro, and it worked out fairly well. However, on the C5s there are so many aftermarket hi-flow muffler replacements that are essentially "straight thru". Therefore, you can get much improvement on the sound without being too loud, as well as a boost in overall performance. Probably the better way to go. Good Luck!
Burning Brakes
Joined: Mar 2010
Posts: 1,189
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From: Freeport, FL
Assuming a stock exhaust, if you install cut outs in front of the cats in order to bypass all exhaust restrictions it will yield hp gains. I couldn't tell you how much, as that what a dyno is for.
It is the exact same principle as a free flowing muffler.
Now, that all being said, the cut outs are a quick and cheap way to unleash some ponies. But if you have the green then you would want a long tube header set-up with 4 into 2 into 1 collectors and an X-pipe (as opposed to an H-pipe) followed by a well designed muffler (a straight through type with spiral core works well). The collector design will provide a "scavenging" effect, and the spiral core is thought to increase flow (marginally) by means of increasing velocity.
It is the exact same principle as a free flowing muffler.
Now, that all being said, the cut outs are a quick and cheap way to unleash some ponies. But if you have the green then you would want a long tube header set-up with 4 into 2 into 1 collectors and an X-pipe (as opposed to an H-pipe) followed by a well designed muffler (a straight through type with spiral core works well). The collector design will provide a "scavenging" effect, and the spiral core is thought to increase flow (marginally) by means of increasing velocity.
Le Mans Master
Joined: Jan 2009
Posts: 6,226
Likes: 33
From: Morton illinois
St. Jude Donor '14-'15
I can feel the extra TQ i get with mine, but I do have a 416 stroker..with no cats and Ti's with the mod pipe in them. Its nice to have a car that sounds like a C6R
http://www.youtube.com/watch?v=irQ84ZHI5Es
http://www.youtube.com/watch?v=irQ84ZHI5Es
Burning Brakes
Joined: Mar 2010
Posts: 1,189
Likes: 4
From: Freeport, FL
I can feel the extra TQ i get with mine, but I do have a 416 stroker..with no cats and Ti's with the mod pipe in them. Its nice to have a car that sounds like a C6R
http://www.youtube.com/watch?v=irQ84ZHI5Es
http://www.youtube.com/watch?v=irQ84ZHI5Es
NICE!!!
Burning Brakes
Joined: May 2008
Posts: 1,147
Likes: 1
From: Mohegan Lake New York
opening up the exhaustwill change the air fuel ratio you might need a retune to take advantage of that mod or if it falls into the envelope that the computer operates your car will need some driving for the computer to "learn" and adjust 50 street miles or 5 passes down the 1/4(if memory serves me correct)
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Thread Starter
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Joined: Jun 2006
Posts: 89
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From: jamestown N.C>
cut outs
vglnte 1 My goodness that thing hauls, it sounds awesome, and man you can catch them gears, thanks for replies guys, this place is great, I think I may go with corsa if not much difference in hp, and I think cuts out will probably be to loud on street anyways. Tom
Melting Slicks
Joined: Nov 2008
Posts: 2,008
Likes: 12
From: NOLA
I almost went with cutouts and with the setup I have they would have been way to loud. I do have Corsa Pace cars which I love, loud when you want and quiet when you need them to be. If I were you I would do mufflers then if you want louder try cutouts or headers
Rob
Rob
Le Mans Master
Joined: Dec 2006
Posts: 7,251
Likes: 16
From: Phoenix Arizona
I can feel the extra TQ i get with mine, but I do have a 416 stroker..with no cats and Ti's with the mod pipe in them. Its nice to have a car that sounds like a C6R
http://www.youtube.com/watch?v=irQ84ZHI5Es
http://www.youtube.com/watch?v=irQ84ZHI5Es
yeeehawwww! 
i like cut outs....... open 'em for the track to scare the competition
and close 'em for stealth street driving they usually do about 50 percent as good as headers and cost A LOT LESS! :p 50 BUCKS VS 1500 BUCKS!
Last edited by rustyguns; Oct 7, 2010 at 01:52 AM.
Le Mans Master
Joined: Jan 2009
Posts: 6,226
Likes: 33
From: Morton illinois
St. Jude Donor '14-'15
thanks guys...
I just keep them open now, even on the street. at first it was to much, but I just love the sound. After a few hours I even get a headache, but dont care. you know the old saying....if its to loud then your to........
I just keep them open now, even on the street. at first it was to much, but I just love the sound. After a few hours I even get a headache, but dont care. you know the old saying....if its to loud then your to........