The Bypass Actuator Kit 15001 has been developed for owners of Edelbrock - supercharged Scion FR - S, Subaru BRZ and Toyota 86 vehicles equipped with older 1556 and 15560 supercharger systems who have experienced an actuator fail or who would like to proactively replace the component before a failure occurs. This bypass actuator valve is a bolt - on replacement that requires no other modification. Bypass Actuator Kit 15001 includes a new vacuum actuator, mounting bracket, hardware and detailed installation instructions.