I went with the 3" JBA Catback. I didnt think it was really loud but everyone I know says they can hear me coming so its not too quiet. It got it for 500 and the cool thing its that unlike a lot of the axle backs that are 2.5" which are selling for 500+, this is a 3" catback kit. This is also the same system that goes on the super snakes minus the Shelby by JBA logo.