Spectre Adjustable Conical Air Filter 2-1/2in. Tall (Fits 3in. / 3-1/2in. / 4in. Tubes) - BlueThis Spectre High Performance Racing (HPR) Air Filter is a blue media clamp on cone filter that can be used for a wide variety of applications. Using the included adapter rings, this filter can fit 3 inch, 3 1 2 inch, and 4 inch diameter tubes. Manufactured using high quality materials throughout, including oiled synthetic media, urethane, and steel mesh, this washable performance filter is precision engineered for low restriction and better