aFe MagnumFLOW Air Filters OER PDS A/F PDS BMW 135i/335i 11-12 L6-3.0L/X1 35ix 11-15 (t) (N55)31 10205 Constructed with 100% polyurethane on all four sides, "oil free" OE replacement performance filter outflows the stock filter resulting in improved horsepower and torque. The Pro DRY S air filter uses three layers of progressively finer mesh cotton gauze media to 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