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Developed for high-output 4 and 2 strokes, FMF Racing Muffler Repack Kit is made of fine interwoven fibers that have been blended to FMF's specifications for high heat resistance and sound absorption. FMF Racing Muffler Repack Kits are perfect for each specific FMF 2 or 4 Stroke Exhaust out there for off-road, racing, or trial riding. Every FMF Muffler Repack Kit has the innovative quality for simple installation. Whatever your Dirt Bike needs are, know that FMF got you covered.