Spectre Performance HPR9831 Universal Clamp-On Air Filter: Round Tapered; 4 in (102 mm) Flange ID; 7 in (178 mm) Height; 5.406 in (137 mm) Base; 4.719 in (120 mm) Top Engineered for increased flow and greater performance Factory pre-oiled and ready to use Quality materials used throughout including washable synthetic media, urethane, and steel mesh Clamp-on Style Air Filter Fits 4 inch intake tubing