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Hypertech Power Chips are engineered for stock 1981-1995 GM vehicles. The Power Chip contains the Hypertech Power Tuning data that controls the engines air/fuel ratio and spark advance for maximum power and performance, plus potential gas mileage improvements. Power Chips can be easily installed, using only hand tools. Street Runner Power Chips are designed for daily street driving or competition in unmodified vehicles using a stock thermostat. Product Features:Designed For Daily Street DrivingFor Unmodified Vehicles w/Stock ThermostatControls Engines Air/Fuel RatioControls Spark Advance For Max PowerPotential Gas Mileage ImprovementsNo Wiring Or Soldering RequiredInstalls In Less Than 30 MinutesProduct might not be available in all states due to local laws.