i installed a banks cat, there was an article in a magazine last year and they compared about 5 or 6 brands. If you google the comparison article it will pop up. they even did a sound recording of each for online. basic thing is bigger engine bigger rumble. I got the banks and its nice, and not high dollar, easy install.
Ended up getting a banks system .. I love it !! Sounds great and definatly noticed a Lil more pick up too! Well worth the money
Borla. Banks both sound great. But i have a custom cat back done by a local muffer guy. Its a short pipe. A magnaflow glasspack and a 3" turn down before the axle. And it sounds bad ass and actuall sets car alarms off. A perfect deep rumble. Awesome sound. Only set me back 90 bucs. But a buddy has the manks monster exhaust. It also sounds great.
all my friends call me COOP a LOOP! Feel free to do the same.