Well I'm going to go with the Pinnicale Power exhaust, it's got a 3. 5 inch down pipe and no muffler for $265, 2 hundred dollars cheaper than anyone else. I have a 4040 Aero turbine I'm going to use, so I told them I didn't need the muffler... I'd really like to run the stans 4" turbo back, but they want the same price 475, even without the muffler... I can't see spending 2 hundred more for 0. 5 inch...