Car Craft just did an article on 2.5" vs 3.0" exhaust this month. The motor was a 500HP 383 Chevy. Both systems were Flowmaster mandrel bent with Super 44 muffs. Peak for peak there was only a 3HP difference between the two systems. But in the mid range there was a 10hp/10tq gain at a few rpm points. So it at that power level if you have a really low car or dont want a bunch of noise the 2.5" mandrel system with high flow muffs can work really well.
Dang...you must of typed that right before me!
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69 Camaro
491 BBC
TH400/GV OD
Currie 9"
Rushforth Livewires
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