K&N Performance Air Intake System (63-2578) 57.1 BMW designed the intake path

BMW designed the intake path to pull air from the low-pressure zone in front of the radiator

and in many cases an undersize filter

Gearbox Front Mounting Bush Insert Kit

which combine with the supplied fittings to form an OEM-looking product when installed

K&N Performance Air Intake System (63-2578) 57.1 BMW designed the intake pathAn enclosed air box design helps protect the filter and inlet air from the heat of the engine bay, and the air box lid allows for quick and easy access to the filter without tools. A high density polyethylene (HDPE) rotationally molded tube helps increase the volume of airflow to your engine, and provides a guaranteed increase in horsepower and torque. These systems are paired with a washable, reusable High Flow Air Filter featuring oiled cotton