Fit For Rover Defender Discovery 200TDI 2.5L Turbo Aluminum Intercooler Cooling Direct Compatible/Replacement. An efficient intercooler system directly contributes to improved fuel economy by enabling a more complete and optimized combustion process within the engine. 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