Jimmy, You could use either 2.5 or 3". As far as performance both will get the job done for your combo. I went 11's with cheap 2.5" mufflers. So the true decisions are based on $$$ available. I would tend to lean toward 3" and try to get it in stainless. Mandrel bent pipes are a must. Many kits are available that fit right in the factory locations. My Borla setup has 2.75" tailpipes and utilize the factory mounting points. I like Flowmaster but have heard very good things about Pypes.
$.02 Walt http://www.personal.kent.edu/~wbainey/CHEVELLE.htm http://www.personal.kent.edu/~wbainey/BORLA.htm ----- Original Message ----- From: "Jimmy C." <[EMAIL PROTECTED]> Date: Monday, February 27, 2006 11:27 am Subject: [Chevelle-list] Exhausts > I'm in the market for an exhaust system,I Have a mostly stock > 454ci .60 over, mild cam with a street avenger 770 , stock open > chamber oval heads ,super comp headers and would like to know if I > should go with a 2.5"inch or 3" inch pipe. The anyone has had any > experiance with Pypes 3"inch crossover system with cut outs. looks > like a nice system, but more expensive than Flowmasters. Jimmy C.