K&N RC-9420 Universal Clamp-On Air Filter: Round Tapered; 2.5 in (64 mm) Flange ID; 4.5 in (114 mm) Height; 5.25 in (133 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