I'm running ATP 3" with a stock catback. Its quiet for me during normal driving conditions. But when I punch it on the hwy at WOT, it sounds great. I hear my turbo more though =) which I love.
Good to hear everyone likes it. I plan on running the A&L downpipe with a cat, I believe that it comes with a long "mid-pipe" that replaces the resonator, is this true? Are you guys also running non-resonated?
I've got an APR with high flow 100cell cat mated to stock cat-back. Sounds awesome at WOT around town, highway = no drone, only when you get on it. Great combo, gurgles when you change gears though, lol I like it