i am wondering if i had a custom dual exhaust made with 2 - 2.25" inlet mufflers, would it be ok or feasible to use 2.5" tubing before the Y where the exhaust splits for the mufflers? i want to do 2.5" mandrel bent ultimately when i can finally get a turbo, but all the shops nearby can only do compresion or crush bending. would this setup's flow be messed up somehow that way?
its on a 2.2 ecotec currently with a inside fender mounted cold air intake, ported throttle body, compcams stage 1 camshaft, pacesetter 4-1 header, and high flow cat.
Of course you can. Realize pipe size changes the scavenging affect of a good exhaust system. Generally, a larger diameter will drop your low end torque, but perhaps raise your high end flow. Compression bends won't make that much difference unless you make a living on a 1/4 mile track.
With out engine size it's kinda a moot point.
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