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Twin Air 154108 Racing Air Filter for KTM 250 SX / 300 EXC 1992 Honda CR125 2011 Polaris Ranger 800 RZRTwin Air Racing Replacement Air Filter Part Number: 154108 Fused dual layer design for a combined increase in performance and protection Revolutionary micro gluing process minimizes seams for added protection Washable and reusable up to 50 times without replacement New Round design boosts air flow Twin Air's breakthrough, fused dual layer design (now widely copied) for combined performance and protection. The fused layers of open pore foam and fine