My G37 put down 533hp and 436 ft tq @ 7.5 psi with this very kit. Only difference now is the intercooler pipes are for a Z.y only other engine mod was a full 3" Turbo back exhaust.
Nick's GTM Stage 2 G37 laying down 533rwhp:
Nick's GTM Stage 2 G37 laying down 533rwhp - YouTube