i have a 2.5" open downpipe. chopped off cat O0PortlandGti said:Hey Gtfly what size down pipe you got? 3in? I hear that's not so good for our car. 3 in is too big and you lose alot of low end torque and hp?? True?? I want to get a new one maybe, but what size and who makes one that isn't 3 in? stock is 2 1/2in so what 2 3/4in, what difference is that?? Let me know whats up?