This is still to date, our preferred method of doing the Kswap into an S2000. This allows you to keep your factory Fuel system (FPR, rail, Injectors), Throttle Body, TPS, MAP, Idle Valve, IAT, and everything fits like factory. The only downside is you do have to do some trimming to fit your intake manifold. [See pics]
Skunk2 Alpha series 70mm Throttle body. B series fitment (same for 2000-2005 Honda S2000). Will fit the Kmiata Kswap Intake manifold. Uses B series TPS/MAP sensors. This has been the best budget throttle body we've used. We've seen many of the cheap throttle bodies stick and rattle apart. We've never had that issue with the Skunk2.
Skunk2 Pro Series 74mm Throttle Body. B series Flange (Same as 2000-2005 Honda S2000 F series). Will fit your stock S2 (00-05) Intake manifold or KPower RWD Intake Manifold. Annoyed with a sticking throttle plate? TPS positioner rattle itself loose? This is your cure.