K&N RF-1021 Universal Clamp-On Air Filter: Oval Straight; 4.5 in (114 mm) Flange ID; 8 in (203 mm) Height; 5.87 in (149 mm) Base; 4.5 in x 3.25 in (114 mm x 83 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