Ford Excursion 2003-2005, Magnum Flow Oval Tapered Air Filter (10-10100) by aFe. Filter Series: Pro 5R. Constructed with 100Percent polyurethane on top and bottom, this high flow, oiled OE replacement performance filter will outflow stock paper 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 cleanings. Integrated urethane bump seal insures tight, no leak seal over the life of the filter.