K&N Clamp-On Air Filter Features: K&N filters can increase horsepower up to 12 Clamp-on style is designed for all racing motorcycles Allows considerably more air flow than stock air box set-up Carburetor adjustment will be required usually a 25 increase in jet sizes can be expected Air filter large end diameter 5.875 in (149 mm) Air filter shape round tapered Base outside diameter 5.875 in (149 mm) Filter material cotton gauze Filter re-oiling amount 1.17 oz (34 ml) Flange inside diameter 4.5 in (114 mm) Flange length 0.625 in (16 mm) Flange type centered Flanges 1 Height 6 in (152 mm) Package contents 1 air filter