Spectre's Extraflow air filter assemblies are engineered to fit throttle body injection assemblies and carburetors with a 5-1/8 inch neck flange. The Extraflow air filter lid is what makes these assemblies look great and stand out from the rest. The assembly is designed to allow air in through the top as well as through the sides, increasing the overall air flow versus a closed stop assembly. These assemblies are available in a 14 inch diameter with 3, 4 or 5 inches tall air filters. In addition, theses assemblies also come with our filter media in red, blue, black or white. Designed to increase hood clearance, the recessed base lowers the air cleaner 1-1/4 inch. Spectre's Extraflow air filter assemblies fit throttle body injection & carburetors with a 5-1/8 inch neck flange. The Extraflow air filter lid allows air to flow in through the top and is available with red, blue, black or white media.