Constructed with 100% polyurethane on all four sides, this high flow, oiled OE replacement performance filter will out flow stock paper filter for improved horsepower and torque. The Pro 5R air filter uses 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 space 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. The Pro 5R air filter has a 98.6 filtration efficiency. In recent testing, this air filter outflowed the factory filter by 58%. The Pro Dry S air filter has a filter efficiency rating of 99.2%.