Installed HKS Hiper exhaust....
 

I got mine tuesday. Installed it that evening. It's the best fitting exhaust I've ever installed. Of course it's the only foriegn car aftermarket exhaust I've ever installed. (mostly mustangs) It sounds great, not very loud, though it does resonate inside the car a little bit during acceleration. Cruising you can't hear it at all. With the silencer installed it's even quieter. The thing that made me really happy is that my milage went up 1.2mpg. I averaged 31.8 before (on almost every tank) and got 33mpg on the next tank-and I've been running it a little harder since I installed the exhaust.

it it a cat-back? where can I get it? im in the market for a new exhaust and my dad will be let me if it gets better mileage

It's an axle back, There is a guy selling some onn protege5.com for 205 + shipping. So far the milage seems better.