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 in (102 mm) Base outside width 3 in (76 mm) Filter material cotton gauze Flange inside diameter 2 in (51 mm) Flange length 0.625 in (16 mm) Flange offset 0.5 in (13 mm) Flange type offset Flanges 1 Height 2.75 in (70 mm) Package contents 4 air filters