Isn’t it a bypass that opens and bypasses the rotor pack under light throttle so the supercharger isn’t trying to compress air when it’s not needed? It keeps the supercharger from heating up and working so hard (trying to suck through a partially open throttle body). It also helps gas mileage when it’s open because the blower is now just freewheeling and not compressing anything. How do you have the blow off valve hooked up? Can you set it up to open under vacuum? MMX has a vacuum operated bypass for the HC