at 15psi on a fully built h22 (with head work) id say youd be pushing 400-450 at 15psi with a GT35R. It is definitely an expensive choice though, so try and find a used one, but really its one of the best matches ive seen for a H22. A T3/04E 57 trim .63/.63 is also good but it doesnt flow nearly as well as the GT35R so youll have to turn up the boost and you will not be spooling up as early as you would with the GT35, but you do save QUITE A BIT of money on the turbo. As Hotrex will attest to though, spending the extra cash is probably gonna pay off for you.