aFe MagnumFLOW P5R Drop-In Air Filter For BMW N54Constructed with 100% polyurethane on all sides, this high flow OE replacement performance filter will outflow the stock paper filter in your N54 for improved horsepower and torque. Multiple layers of progressively finer mesh gauze media provides maximum convenience and easy maintenance. Washable and reusable for multiple cleaning cycles, the tall open evenly spaced pleats provide excellent dust holding capacity for longer service cycle between