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 shape oval straight Base outside length 4.5 in (114 mm) Base outside width 3.75 in (95 mm) Filter material cotton gauze Filter re-oiling amount 0.28 oz (8 ml) Flange inside diameter 2.438 in (62 mm) Flange length 0.625 in (16 mm) Flange type centered Flanges 1 Height 2.75 in (70 mm) Inner wire no Package contents 1 air filter