Use this harness for swap applications that are wired to use 02-04 ECUs (engine control units). Since KTUNER uses ECUs that match 05-06 RSX Type S or 03-06 Honda Element, you will use this harness to convert your 02-04 vehicle to use a KTUNER Swap ECU. Some interior swap harnesses are wired differently and may not be compatible, please verify the wiring is correct before installing an ECU and starting your vehicle.