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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 kit uses a progressive controller that proportionally injects more or less according to manifold vacuum. Start and full points are adjustable for engagement and delivery curve, to match what the engine requires. High compression modified engines can gain performance through cooler intake charges and the large increase in octane and detonation suppression. It can also be geared towards fuel economy and using lower grades of gasoline. Comes with one 4500-style 1" Dominator carburettor spacer plate threaded for Snow Performance injection nozzles, and a solenoid to prevent vacuum siphoning.