K&N RU-3700 Universal Clamp-On Air Filter: Round Tapered; 3 in (76 mm) Flange ID; 4 in (102 mm) Height; 5 in (127 mm) Base; 4.625 in (117 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