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Rywire 02-04 K-Series RWD Mil-Spec Eng Harness w/02-04 Wiring/K-Pro ECU/S2K Trans/K-Series TB/Intake To complete your Kswap wiring, you'll need to use the Rywire specific chassis jumper.
RWD K Series Rear Coolant Housing - K24/20z3 RBB style. Also included is a 1-1/4" to 1-1/4" Inch Hose Barb Splice Coupler to extend your upper radiator hose. [You'll need to source a short hose with a 90* bend.]
Running a K series engine harness but using your stock S2000 (00-05) throttle body? You will need to convert the TPS Connector to the older B series style. Or just use this quick and easy jumper/adapter. plug in and go.
Running the RSX Engine Harness/ECU? This is the chassis adapter to plug it into your S2000. Only works for 2000-2005 year S2000's. IF USING RYWIRE ECU HARNESS- you will use the other Rywire Specific Jumper Harness.