K&N RF-1633 Universal Clamp-On Air Filter: Round Tapered; 3.938 in (100 mm) Flange ID; 6 in (152 mm) Height; 5.438 in (138 mm) Base; 4.5 in (114 mm) Top Designed to increase horsepower and acceleration Hundreds of sizes and shapes for most applications High air flow with excellent filtration Clamp-on washable and reusable air filter Pliable flanges absorb vibration and can be stretched up to 1/16 In. to fit in-between sizes