no, u eliminate ur intake with a turbo because the filter comes right off the turbo itself, not on the SC though. www.jacksonracing.com u can see how the SC works and is setup. u dont need a 3inch even tho i think it would help, but at hte same time woudl be extremely loud also. 2.5 would be fine, hell i'm runnin 60 mm (2.36 in) and i'm still makin good power, tho i dont doubt bigger piping would yield a few more horseys.