Exhaust Question
Thread Starter
Safety Car
Joined: Mar 2005
Posts: 4,723
Likes: 11
From: Winnipeg Manitoba, Canada
Exhaust Size Question
Right now I have 2 1/4 inch exhaust pipes. Would it make a big difference going to 2 1/2 inch? The engine was just rebuilt with a bunch of performance parts like cam, intake, runners, ported plenum, 24lb injectors, headers etc. Would it be worth the money to change the exhaust? 
Last edited by jimmers; May 24, 2007 at 08:02 PM.
Le Mans Master
Joined: Apr 2005
Posts: 8,077
Likes: 4
From: Scarborough ONTARIO
When i had single exhaust with LT headers, and than i replaced it with Corvettecentralexhaust.com true dual exhaust for L98, its an 2 1/4 piping with H-pipe in middle, i picked up .2 sec and 4 mph in a 1/4 mile.
Since ur engine is not highly modded so doing 2 1/4 CCe.com will be better, but its aluminized steel and not mandrel bent tubing. but its pretty strong, same exhaust pete k has for yrs and yrs.
But if ur modding ur car in future, its better to go 2 1/2-2 3/4 piping dual exhaust or used LT1 exhaust and just purchase LT1 hangers from GM dealer or order it from CCE.com. Hope this helps.
edit: get rid of that single exhaust.
Since ur engine is not highly modded so doing 2 1/4 CCe.com will be better, but its aluminized steel and not mandrel bent tubing. but its pretty strong, same exhaust pete k has for yrs and yrs.
But if ur modding ur car in future, its better to go 2 1/2-2 3/4 piping dual exhaust or used LT1 exhaust and just purchase LT1 hangers from GM dealer or order it from CCE.com. Hope this helps.
edit: get rid of that single exhaust.
Race Director
Joined: Jun 2004
Posts: 13,934
Likes: 704
From: WI
Is your system mandrel bent? Going to a 2.5" mandrel system should net some gain. On my old turbo car there was a nice difference from a 2.5" non-mandrel to 3" mandrel bent system. The boost really ran up quick from less back pressure. Not the best comparison but I remember how good it was. 
Any idea the HP? If you go to big you can lose some velocity, so matching the pipe size to the HP can help.
That Corvette Central system is 2.25" from what I remember, he already has that.
Any idea the HP? If you go to big you can lose some velocity, so matching the pipe size to the HP can help.That Corvette Central system is 2.25" from what I remember, he already has that.
Thread Starter
Safety Car
Joined: Mar 2005
Posts: 4,723
Likes: 11
From: Winnipeg Manitoba, Canada
The exhuast is mandrel bent pipe, and we figure the engine has about 400hp at the crank. I'm going to get it dynoed in a week or so to know for sure.
Last edited by jimmers; May 24, 2007 at 08:54 PM.
Safety Car
Joined: Jan 2006
Posts: 3,566
Likes: 4
From: Mt Laurel NJ
St. Jude Donor '06-'07
Thread Starter
Safety Car
Joined: Mar 2005
Posts: 4,723
Likes: 11
From: Winnipeg Manitoba, Canada
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