aFe MagnumFLOW Air Filters OER P5R A/F P5R BMW X3 05-10 / Z4 06-08 L6-3.0LConstructed with 100 percent polyurethane boxed frame, this high flow, oiled OE replacement performance filter will outflow the stock filter for improved horsepower and torque. Five layers of progressively finer mesh cotton gauze media provide maximum airflow for best performance results. Washable and reusable for multiple cleaning cycles, the tall open evenly spaced pleats provide excellent dust holding capacity for longer service cycle between