An VW Gti Greddy intercooler (sometimes known as an aftercooler ), or charge air cooler, is an air-to-air or air-to-liquid heat exchange device used on turbocharged and supercharged (forced induction). car engines to improve their volumetric efficiency by increasing intake air charge density through nearly isobaric (constant pressure) cooling. A decrease in air intake temperature provides a denser intake charge to the engine and allows more air and fuel to be combusted per engine cycle, increasing the output of the engine. In a vehicle fitted with two-stage turbocharger, it is possible to have both a intercooler (between the two turbocharger units) and an aftercooler (between the second-stage turbo and the engine). Greddy  Intercooler 's can vary dramatically in size, shape, and design, depending on the performance and space requirements of the entire supercharger system. Common spatial designs are front mounted intercoolers, top mounted intercooler 's, hybrid mount intercoolers. Each type can be cooled with an air-to-air system, air-to-liquid system, or a combination of both. Passing a compressed and heated intake charge through a Greddy intercooler reduces its temperature (due to heat rejection) and pressure (due to flow restriction of fins). If properly engineered, the net result is an increase in density. This increases system performance by recovering some losses of the inefficient compression process by rejecting heat to the atmosphere. Additional cooling can be provided by externally spraying a fine mist onto the intercooler surface, or even into the air intake itself, to further reduce intake charge temperature through evaporative cooling. A Greddy intercooler can be very complicated to install like all other intercooler kits. Greddy gives you all the hardware with your kit, but you still may need some professional help. On most cars it is required to remove the front bumper and grill to install your Greddy intercooler.  

Greddy Intercooler  that exchange their heat directly with the atmosphere are designed to be mounted in areas of an automobile with maximum air flow. These types are mainly mounted in front mounted systems . Today most cars all use front mounted intercooler(s) mounted near the front bumper, in line with the car's radiator. Air-to-liquid intercoolers are heat exchangers that transfer intake charge heat to an intermediate fluid, usually water, which finally rejects heat to the air. These systems use radiators in other locations, usually due to space constraints, to reject unwanted heat, similar to an automotive radiator cooling system. Air-to-liquid intercoolers are usually heavier than their air-to-air counterparts due to additional components making up the system (water circulation pump, radiator, fluid, and plumbing).

A big advantage of the air-to-liquid setup is the lower overall pipe and intercooler length, which offers faster response (lowers turbo lag).

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