K&N RC-1900 Universal Clamp-On Air Filter: Round Straight; 2.25 in (57 mm) Flange ID; 2 in (51 mm) Height; 3.5 in (89 mm) Base; 3.5 in (89 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