Ok so I just got a Tsudo N1 catback exhaust and it is unbelievable. It comes with 2.5" piping, a 13" resinator, and a 4.5" tip. The sound is unbelievable and the horsepower increase is noticeable. If anyone is in the market for a new exhaust, I strongly recommend this one. I will be posting a sound clip on you tube very shortly!