i am currently running the dc sports downpipe and greddy evo sp2 catback...the best thing with this combination is that the downpipe deletes the "cat" so you do not have to buy a test pipe...at low rpm's ranging from 1000-3500 it has a nice tone, and at WOT is has a real deep growl....its perfect, especially if you want a good quality exhaust that is a full 3 inches, amazing fitment, and great sound. not too loud not too quiet.