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Twin Air Dual-Stage Foam Air Filter for Honda CRF250R / CRF450R - 150221X 2005 Yamaha YFZ350 Banshee 1994 Polaris Indy 650 RXLTwin Air Racing Dual Stage Replacement Air Filter 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 inner foam