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This is a reference for wiring a K20A into a race car. Incorrect wiring is the cause of many problems with engine swaps and you must follow the wiring diagram below. In general, you need to K20A engine wiring harness. This harness plugs straight into the ECU A and B connectors, leaving only the ECU E connector and the engine harness 20 pin connector for you to wire in.
 
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