The VC-20 controller is a progressive water-methanol controller that can be mounted in the cab/engine bay. Referencing boost (1-20 PSI) this controller will progressively inject water-methanol to match the boost curve of your vehicle. Completely stand alone, this controller will not affect operation of any other vehicle systems. Included 3 wire harness means the only wiring needed for controller is good ground, 12V key on power source, manual boost source, and connection to a Snow Performance pump.