Constructed with 100% polyurethane on all four sides, this high-flow, oiled OE replacement performance filter will outflow stock paper filter by up to 40% for improved horsepower and torque. The Pro 5R air filter uses five layers of progressively finer mesh cotton gauze media to provide maximum airflow for best performance results. The Pro DRY S air filter uses three layers of progressively finer mesh synthetic media to provide maximum convenience and easy maintenance. Washable and reusable for multiple cleaning cycles, the tall open evenly spaced pleats provide excellent dust holding capacity for a longer service cycle between cleanings. An integrated urethane bump seal insures tight, no leak seal over the life of the filter.