I want to get a new exhaust made up for my mk4 gsi, what size exhaust should i be looking at for best power gains? 2.5" 2.75" or 3"? i noticed most ppl go for around 2.5", is there anyone running bigger? i want the lease restrictive for bhp but not sure if 3" will lower the torque? will be a custom stainless system, pre cat, sports cat, and silencers. thanks in advance.