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Does anyone know the size of the stock y-pipe(out of the exhaust manifolds), and if i have one built, do i need to use bigger or same size pipes, then also at the Y, what do i need the collector size to be before the cat???
Lance
Lance
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<b>Black</b> 1998 Pontiac <i>Firebird</i> A-4 swap<br />271.4rwhp/259.4rwtq NA<br />13.30@102.44 <br /><a href=\"http://www.freewebs.com/wickedsix98\" target=\"_blank\">www.freewebs.com/wickedsix98</a> -
stock is 2.25 pipe you can only go about 2.5 inch pipe because you ill run into clearance problems with the pipe being the lowest point on the car and clearance for the oil plug drain. It is your choice to take the risk of a bigger pipe and have it hand lower than the bump guard. If you hit a speed bump or something you may have some serious problems tearing up the pipe and manifolds.
I was going to do this but decided against it. The collector right before the cat is 3" stock
you have 2.25 from each manifold dumping into the 3" in front of the cat. I believe it is the 90 degree bends in the s shape right after the cat is really the bottleneck of the system. You can have a 3" pipe come off the cat or a replacment hiflow cat and make it more straight or sort of a 45" bend instead of the s bend and then have a 3" cat back system.
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