Exhaust systems

[INSIDIOUS '86]

Originally Posted by GM-power

Cubic inches has nothing to do with what size exhaust you have.... your buddys truck has a new motor that will eat yours alive. You have to have force to push the gases out; with a dual 3in system you need to have one stout engine. Go with a duel 2.5 in. with a crossover pipe and that will give you good sound and added performance. If your sold on a 3in spend the money and find out why its not very good for the application. ...
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Cubic inches factor in no mater what. And since the OP didn't post specs of his engine we can't say weather 3" is to big or not.
There's such thing as too small for exhaust but no such thing as to big, just inefficient at certain Rpms.

A 2.5 system accommodates a great range of engines for the street. A 3 in system can lose you as much as 25ftlbs at the low range of rpm but give that back at the top end.

There's a lot of factors that effect how a SYSTEM of exhaust works other than flow potential. Headers vs manifolds collector length tailpipe length. Balance tubes x pipes. Millions of mufflers. Firing orders, engine size, port size etc etc
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