Universal Magnum Flow IAF Oval Tapered Air Filter (21-91044) by aFe. Filter Series: Pro Dry S. Flange Inside Diameter: 5in. Base Outside Length: 9in. Base Outside Width: 7.5in. Top Outside Length: 6.75in. Top Outside Width: 5.5in. Height: 7.5in. With three layers of progressively finer mesh synthetic media between 100Percent polyurethane top and base, this high flow, �oil-free� conical performance filter provides maximum convenience and easy maintenance with excellent airflow. Washable and reusable for multiple cleanings, the tall open evenly spaced pleats provide excellent dust holding capacity for longer service cycle between cleanings. Pliable polyurethane flange insures tight, no leak seal over the life of the filter.