For many types of applications, Spectre offers their High Performance Racing (HPR) Air Filter. This red media clamp-on filter features a top that houses an inverted cone filter for improved service life and enhanced flow potential. Included are adapter rings which can fit 3 inch, 3-1/2 inch, and 4 inch diameter tubes. Only the highest quality materials were used including the oiled synthetic media, urethane, and steel mesh. This filter will allow low restriction, better performance, and long service life. This 5-1/2 inch tall air filter comes factory pre-oiled and ready to use.