I have the mopar catback exhaust and it sounds really nice when you are not going over 65. Once you are going over 65, forget having anyone in the back seat. It is really loud. I also have the mopar CAI. I paid $1500 for the CAI and Catback exhaust installed. I have an RT auto and I really like the looks of the Mopar catback because it has two pipes on each side. It sounds awesome when you start it up. It has a very loud drone noise at times and like I said it is really loud when you go over 65. As far as performance, I have a best 0-60 time on a flat road with no decline of 4.73. I did over 30 runs and I hit under 5 seconds 5 times. Other times varied from 5.1-5.5. I thought that Mopar claimed it had anti-drone technology on their exhaust system, but that is not true. I am still deciding if I want to keep it. Bottom line is it has good performance but it has some drone noise.