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FMF Racing Dirt Bike Mufflers for Gasgas are designed for closed course competition. They are made to provide improved torque, increased horsepower, and long lasting functionality. These mufflers will deliver race-inspired performance. FMF Racing Dirt Bike Mufflers are made of durable stainless steel and aluminum construction, along with advanced packing material for maximum longevity. They also include a removable spark arrestor and offer an optional 96 dB quiet insert. Order it here at a reasonable price. Free shipping!