I wana chime in here with my 2 cents and let you know Dynomax mufflers are loud as hell man. Im running the dynomax super turbo dual cat back and I'm not sure if I really love the sound. Its pretty ricy around 1800-2200 rpm. I think they look awsome especially the dual, atleast IMO, but make sure you hear it before you buy it so you make sure you like it. Its still a great product! And ontop of that it deffinitly freed up a little hp and tq because the muffler is much smaller and much less restrictive. My 3.8 JK revs more freely now. Thats an honest judgement there too because I did not buy the exaust for performance. Goodluck on it man!