BMW 3-Series 2012, Magnum Flow Panel Air Filter (30-10225) by aFe. Filter Series: Pro 5R. This Pro 5R air filter provides performance filtration and maximum convenience. Constructed with 100Percent polyurethane on all sides, this high flow cotton gauze OE replacement performance filter will outflow the stock paper filter for improved horsepower and torque. Five layers of progressively finer mesh cotton gauze media provides maximum convenience and easy maintenance. 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. In recent testing, this filter outflowed the factory filter by 31Percent.