Over the decades, FMF has seen an amazing transformation in the world of motorcycles and ATVs. The progression of the technology is one of the challenges that keeps them going. There is always one major force that keeps FMF motivated - throwing a leg over the bike and heading for the trails or the track. The biggest reward is knowing FMF is helping their customers get the most out of their riding experience. Replacement Spark Arrestor insert for FMF Powercore 4 Hex 4-stroke exhausts. U.S.F.S.-approved. Notes: For closed course competition use ONLY. Not intended for street use. Image is for display ONLY, actual product will vary by fitment.