Quote:
Originally posted by mike2002@Mar 23 2005, 10:55 PM
i think 2.5 is a little big for a near stock cars exhaust....you may want to say, light bolt on's is 2.25 tops, 2.5 for heavier mods. i know lots of other much more powerful cars recommend 2.5", and where talking 300+hp.what you need is maximum velocity and scavanging effect (smaller pipe helps with this) and minimum backpressure (free'er flowing muffler)
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Exactly. exhaust backpressure does not make low-end power. the correct piping size to balance good velocity and high rpm flow works the best, along with the most free-flowing muffler you can get. the 2.25" for light mods and 2.5" for heavier mods is just right. 3" is a must for forced induction where the exhaust gets pushed out instead of relying on the smaller piping's velocity to draw exhaust out of the engine. but no matter what, you want the very least amount of backpressure possible.