Description: These harnesses are designed for 99 – 03 Vortec retrofits into older muscle cars and street rods or newer non-emissions controlled vehicles. They are completely plug and play with switched power, constant power and ground connections required. Harnesses allow for installing the PCM underneath the dash of your vehicle with a sliding grommet seal for that professional leak proof look. Harnesses are professionally constructed from Brand New GMDelphi Connectors and TXL (Polyethylene Cross Linked) High Temperature Wire to GM Specifications. All harnesses are 100% Quality Inspected prior to shipping. Note that harnesses are for non-emissions equipped vehicles and do not include air pump or EGR provisions. All harnesses require PCM VATs removal.