K&N RG-1001WT Universal Clamp-On Air Filter: Round Tapered; 3 in/3.5 in/4 in (102 mm/89 mm/76 mm) Flange ID; 5.5 in (140 mm) Height; 6 in (152 mm) Base; 4.75 in (121 mm) Top Designed to increase horsepower and acceleration Includes inserts to fit three different flange diameters High air flow with excellent filtration Clamp-on washable and reusable air filter