funny how people say when u put on a bigger exhaust system that they'll bog down, thats a load of rubbish, its more so to do with the way the headers flow.... im running a 2.5 cat back mandrel bent, as im goin turbo the d16 next year, and honestly i cant feel the difference... still feels like the same ol d16 as when it was stock. yes its over kill on a stock d16, but i still love the sound it puts out