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Snow Performance 4150 Flange Gas Stage 1 Naturally Aspirated Water Inj Kit (SS Braided 4AN Fittings) Pumps 52mm ID Single Valve SpringsRun 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