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The Nitrous Express water-methanol injection system for gasoline stage 1, naturally aspirated and carburetor run engine increases your pump gas octane by 20-25 points and makes more power. It works on engines with 11:1 to 13:1 compression ratio or more. This gives 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. It comes with one 4150-style carburetor spacer plate threaded for 1/8 inch injection nozzles, and a solenoid to prevent vacuum siphoning. The system includes SHO (Special High Output) pump, 1 inch carburetor 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 and comprehensive instructions.