I just got the Gibson Super Truck Exhaust installed on my truck 3 days ago. It sounds AMAZING!! I have a 2003 3.7L Reg. Cab. RAM, and I must say it sounds really bad *** being as it's on a V6. It has a really deep mellow sound in the low RPM's but get's into a much more racing tone in the high RPM's. But I just wanted to let you guys know that...