Holley PNP Mac Valve Harness

Add boost control to your Holley equipped vehicle with our Mac valve harness. The harness plugs into your power tap connector with a pass-through design allowing you to maintain connections you may already have established with your power tap connector. The other end of the harness plugs into a Mac valve either single 3-port or single 4-port and requires you to connect the last wire to your input/output harness. 

Once installed, a custom PWM- output can be set up in the Holley software to be able to control the duty cycle of the mac valve. This duty cycle will be a reference to a given boost level on your particular setup.