is there a upgradeable compressor for the intake side of the turbo for a wrx? I searched and cant find one at all. I know people doing it on 240sx's and rx7's but cant find for the wrx.

 

Forced performance offers an upgraded stock turbo for $595 plus core, which includes a larger compressor wheel. It used to be a decent value for someone looking for a bit more power on stock fuel, but with the recent price drop on IHIs, it's be easier to just throw a VF30 on it for $650 outright and run 13psi if you dont have injectors/EM.