get a ultrex turbo back with oval muffler, then go to AS for a tune to get most out of it. if your budget is a few grand, it will be worth it

ADZ from OCD is the best, you have to wait and he charges appropriately... but you get what you pay for!

__________________
Wide Body GC8 WRX
#217 Street Cars WA
Full 04 STi drivetrain
08 JDM 207
Garrett 3076 xtr