Upgrading to the Hondata K-Pro Ecu in your S2000? Here are the OEM parts you need for the install. Crank sensor 37500-PZX-003 Crank wheel 13622-PCX-013 TDC sensor 37510-PZX-003 TDC wheel 14112-PCX-003 Valve cover 12310-PCX-020 Drain plug washer (for PCV valve) 94109-14000 PCV valve 17130-PCX-003 IAT sensor 37880-P05-A00 (not required, but stock IAT will read about 30 degrees hotter)