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Hypertech Power Coils average between 45,000 and 55,000 volts, which is significantly higher than the average stock voltage of approximately 36,000 volts. Working in combination with your spark plugs, the higher energy allows for fatter, hotter sparks to improve the fuel burn in the engine's combustion chambers. Improved fuel burn can increase horsepower and sometimes increase the gas mileage. Power Coils are easy to install, with no modifications required, and when they are used in street or slightly modified engines they are capable of firing the engine up to 7000 RPM.