This harness plugs in between the stock ECU and its wire harness. When installing aftermarket electronics, use this harness to make your splice connections. This eliminates the need to splice into or modify your stock harness. Customers have asked for a way to install Performance Calibration Units in their vehicles and remove them without leaving a trace. This is useful if you decide to sell the vehicle and return it to stock.
These harnesses are of the highest quality and use the very same OEM connectors that are installed on your stock ECU harness.