I just installed my American Thunder cat back system. I think it sounds pretty good. It could be a little louder though. I think it helped the car out some performance wise too. Now I'll have to tear into the intake when I get some more cash.

 

it'll get louder. finish the exhaust, and it'll get rid of that burblling backpressure in your exhaust. you'll love it.<IMG src=smileys/smiley20.gif border="0">

 

When I get the cash I plan on getting apair of headers, and I'm gonna do something about the cats.

 

The only way of getting louder is to forget the mufflers and runstraight pipes. Too loud IMO.