Universal Magnum Flow Round Tapered Air Filter (24-38505) by aFe. Filter Series: Pro 5R. Flange Inside Diameter: 3.75in. Base Outside Diameter: 6in. Top Outside Diameter: 4.75in. Height: 5in. This high flow Pro 5R air filters are constructed with 100Percent polyurethane on all sides and will out flow the stock paper filters for improved performance. Five layers of progressively finer cotton media provides maximum air flow. Washable and reusable for multiple cleaning cycles, the tall, open and evenly spaced filter pleats provide excellent dust holding capacity for longer service cycle between cleanings. An integrated urethane bump seal insures a tight, leak-free seal over the life of the filter. The aFe filter system increased air flow 25Percent over the factory air filter set increasing horsepower, torque and improving throttle response.