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Join Date: Nov 2002
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My only input here - You need to consider exhaust as a system comprised of headers, intake, cat, and cat back setup in order to get the most out of it. You're not going to get huge gains by replacing these pieces seperately, but you will gain (maybe 10 horses?) by replacing the whole system. Another consideration with exhaust is the pipe diameter. I've heard that a stepped system (assuming 2.25 inch collectors at the headers you would gradually step up to 2.5 or greater to through the system) works best due to exhaust gas flow etc. If the car breathes better, end expells exhaust more efficiently, you gain more than just HP. Your car will be more fuel efficient, sound better, etc.
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