TWIN AIR HIGH PERFORMANCE AIR FILTER, UNOILED, YZ125 97-21 YZ125X 20-21 YZ250 97-21 YZ250F 01-13 YZ250X 16-21 WR250F 01-02 WR/YZ400F 98-99 WR/YZ426F 00-02 YZ450F 03-09

Twin Air's Original Dual-Stage patented design, high quality materials and superior construction deliver unbeatable performance and protection. Twin Air Filters are the hands-down choice of more World and National Champions than all other filters combined.