So i just installed my new pipe, got a 2 1/4" up pipe and a 3" down pipe. Had a catback for a few months now. So i took it for a test drive and wow, i didnt expect to see gains like that. Its like having a whole new car, now i just gotta get a tune and ill be set. Was smoking a bunch when i took it for a little test run, had to tighten the oil line that goes into the turbo. Just wanted to say though, without the info on this site which eventually lead to the perrin site i would have never got that damn up pipe out!!!!