Abstract: Apparatus for decreasing the temperature of the air entering the carburetor or throttle body of an internal combustion engine to increase the volume and efficiency of the air. A device which combines an air-to-liquid cooling surface and an air filtering system is installed as a replacement for the standard air filter. Cooling is provided by circulation through the cooler of a coolant. In automotive applications, this is accomplished by means of a closed system including a pump, reservoir, cooling tank which utilizes a standard air-conditioning dryer and/or a radiator. In marine applications, a constant supply of fresh water is supplied as the coolant using an open system. A limiting device is employed in all applications to disable the coolant circulation system when it is not needed.