Run 11:1 to 13:1 compression ratio (or more) on pump gas!! Increase your pump gas octane by 20-25 points and make more power. More power and efficiency with cooler running for your naturally aspirated V8 Muscle Car. This system uses a wide open throttle switch to activate the Water/Methanol only under full load. High compression modified engines can gain performance through cooler intake charges and the large increase in octane and detonation suppression. This system allows you to save money by using lower grades of gasoline. Comes with one 4150-style Carburetor spacer plate threaded for 1/8" injection nozzles, and a solenoid to prevent vacuum siphoning. System includes: SHO (Special High Output) Pump 1" Carb Spacer Plate Solenoid Valve to prevent Siphoning 3 Quart Reservoir WOT (Wide Open Throttle) switch 2 nozzles cover a Wide Range of Horsepower All Required Hardware Needed For Installation Comprehensive Instructions