SLP!!!! i got them about 2 months ago and you still can't peel the grin off my face whenever i get in my car. when i stand on it, everyone looks (and my head gets progressively bigger, lol). quieter then my old flows at IDLE, but i kind of like it that way. quieter at idle, scary loud when you open it up. even my friends with f-bodies (one of them with an 02 SS with slp exhaust) have told me they wish their car sounded like that. with christmas comes the UPR x-pipe, and i can't wait. the nastier the better. if you get a chance to hear the SLP loudmouth in person before you make any purchase... please do, you won't regret it and i think it'll help you decide ;-)