As i under stand it 2.5" should be fine. THe idea of a 3"+ on turbo apps is that it creates a low pressure area. The high pressure gases on the exhaust manifold side then rush over the turbines to the low pressure side (Highs to Lows always, basic physics) which moves more air faster over the turbine blades themselves (turbine blades are essential small lift producing devices) spooling it up faster.
I'm guessing 2.5 should be fine for a SC application but maybe a 2.75 would be better? Might have more to do with how much power you are trying to make and thus how much fuel you'll be burning. More fuel burned would equal more exhaust gas to flow, no?
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