High Flow Airbox Y60 A tight airbox with a much larger capacity than the serial one. Indispensable when increasing engine power. The product fits a car with a BMW engine with an enlarged aluminum radiator and a production car with an RD28 engine if the expansion tank is moved by approx. 1.5 cm Made of aluminum, powder coated. Polycarbonate filter cover. 3" (76mm) inlet/outlet. It has a drain plug in case water gets in. Installation requires drilling additional holes and enlarging the opening in the body. Set contains: Airbox with cover. Seal. A set of mounting screws. Can be purchased with an air filter.