K&N Performance Air Intake System for the N54 engine, as found in the E82 1M Coupe, E8X 135i, E9X 335i and more. This system replaces the original factory airbox and includes design elements for improved flow, including a large K&N air filter (part no RU-5293).

This system is a direct replacement for the original airbox/filter and offers superior filtration and improved performance. It is also cleanable and so will never need replacing. Drop-in fitment.

Replaces BMW part number 13717556547.