I think a good reg return fuel system, FASS pump or Airdog w/ Raptor, a set of 190cc injectors, and a VGT-SS or similar sized non VGT. Of course a CAI, turbo back exhaust, and some really good tuning Ie: Eric @ Innovative... Should get you close to 500. For reliability you'll probably need a tranny sometime after that. How soon depends on how you drive it.