HA Motorsports ECU jumper harness for installing an 05-06 RSX ECU into 02-04 RSX, 02-05 EP3 Civic Si, or K-swap when using an 02-04 style engine harness. This harness is commonly referred to as a "KTuner Jumper". Uses all new OEM connectors for OE quality fitment. All HA Motorsports ECU jumper harnesses are constructed using cross-linked automotive TXL wire which exceeds OEM specifications and is extremely durable. - For manual transmission vehicles only. Designed and built right here at our facility in the USA!