Hey I think i have decided on an exhaust i think im just going to go with a muffler up grade insted of duels because cash is a lil short, and i can get a cai or a tuner with the lil bit of cash i can save. im gonna wait till i save up for a GT bumper to go duel. do you guys think there will be any performance increase with the SLP Powerflo? I have Watched some videos on you tube and i thinks it sounds pretty good for sungle exit exhaust. Also to anyone with 3:73 gears. What RPM is your cat at, at 60 -65mph? and is there any cut in MPG's? Thanks!