Originally Posted by EtoS
You'll also need a tune(only cobb AP access port can tune 06's right now-that's another $650) or else your car will run like crap and throw out check engine light warnings after a while. Subarus aren't like the cars of the past that throwing on headers, exhuast and cone air filters alone will give you added power- it's more about the computer tuning with each upgrade you do, be it no upgrades at all or full setup.
you dont need a tune for a catback, you wont run like crap or throw out CEL's in most cases if you have the fixes. You can get an exhaust first without tuning for a while if it pleases you.
That said, I have an HKS Hi-power catback I'm selling. PM'd you. sound & power.