Fit For 987 997 99710603702 One Intercooler Tank. By significantly lowering the temperature of air compressed by the turbocharger, the intercooler increases its density, allowing more oxygen to enter the cylinders for combustion. The presence of an intercooler effectively prevents engine knocking or detonation, which safeguards critical internal components from potential damage under high boost. Increasing Air Density: The increased density of cooled air allows more oxygen to enter the cylinders, improving combustion efficiency. 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., Manufacturer: NHABXGDS