Spectre Clamp-on Air Filters are a line of universal filters that come in a variety of sizes, heights, and colors to fit your specific application. Engineered for increased flow and greater performance, this performance air filter is factory pre-oiled and ready to use. Manufactured using high quality materials throughout including washable synthetic media, urethane, and steel mesh, this filter features a triple chrome plated steel top and base. Using optional velocity stacks, this filter can fit 2-1/2 inch, 3 inch, 3-1/2 inch, and 4 inch tubing. Spectre s High Performance Racing (HPR) Clamp-on Air Filters are a line of universal filters that come in a variety of sizes; heights; and colors to fit your specific application.