Abstract: A kit and a method for minimizing combustion knock and improving fuel economy in an internal combustion engine which includes a cooling system having a first thermostat which blocks the flow of coolant until a first specified temperature is reached. The kit includes a second thermostat and a recalibrator. The first thermostat is removed and replaced with the second thermostat which allows coolant to flow at a second specified temperature at least fifteen degrees lower than the first specified temperature. Replacing the first thermostat with the second thermostat reduces the temperature of the engine by about fifteen degrees which helps to minimize combustion knock. A recalibrator is coupled in parallel with the thermistor to modify the control of the engine's fuel system and spark system by the engine's electronic control module. Adding the recalibrator results in a spark timing and fuel setting which further minimizes combustion knock and improves fuel economy.