Hey and welcome... If your running the stock turbo, a 2.5" turbo back exhaust is plenty, the larger you go, the louder it gets. If you want it that way, step it up to a 3"/4" system, it will sound like a dump truck. If you think your going to upgrade to a larger turbo it wouldn't hurt to do a 3" downpipe in the first place, you can always modify it slightly with a different flange or whatever if you change turbos down the road.
Jason
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