Fit For 5 SUPER 5/R5 9/11 5GT TURBO Manual 1985-1991 MT Aluminum Radiator. The intercooler enhances engine reliability and longevity by reducing thermal stress on pistons, valves, and other parts exposed to high temperatures. This component reduces the emission of harmful pollutants like nitrogen oxides by maintaining lower combustion temperatures and promoting cleaner burning. Lowering Intake Air Temperature: Cools the high-temperature air compressed by the turbocharger through air-to-air or air-to-water heat exchange, preventing damage to intake sensors. Increasing Air Density: The increased density of cooled air allows more oxygen to enter the cylinders, improving combustion efficiency., Manufacturer: DGOINGPI