well i take it you are gonna stay NA with Type R Pistons, if you want to do the Valvetrain upgrade then go with Skunk2 or Crower Stage 2 - 3, if no valvetrain, then skunk2 stage 1. I just did the same setup in my gsr....put type r pistons and rods with skunk2 stage 1 cams and intake manifold. Sounds nice.