Have done ECU (GReddy Emanage Ultimate), Fuel Pump, Injectors, Z32 AFM, and upped the boost to 12psi... still stock turbo though. Not sure if the ECU was directly responsible for all the increase in power as had everything put on at the same time, but was pretty happy with that figure seeing as i haven't really done anything major to it. Had it tuned at Boostworx, really good guys there. Looking at a turbo upgrade in the near future....