Intake, Intake manifold, and Cams would be the biggest differences. It utilize those a different ECU. There is a slightly better exhaust as well. The head itself is different but not enough so to warrant changing. THere is also a slight bit more compression which works with more aggressive cams.

YOu want similar power I would suggest . . . Skunk2 Intake Manifold, Comptech Icebox, Type-R Cams and a Power FC or Hondata (VAFC will work too but not as well). A mild exhaust would not hurt either. If you hate loud exhausts look at a stock ITR exhaust with some modification needed or an Apexi World Sport.