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The FMF Racing Factory Fatty pipe for Dirt Bikes has been tried and tested and produced by the very best racers and craftsmen within the sport to offer high performance and quality. It is designed using different thicknesses in steel for the upper and lower construction of the pipe. The bottom of the pipe is more resistant to dings and dents, while the top and back section is lighter and more wave resonance friendly. In order to maintain the FMF Factory Fatty pipes, WD40 is used in its manufacture so as to keep them looking new over the years as well as to prevent rusting. Seeking to change your bike into a race-ready powerhouse? The Factory Fatty is the right pipe you need to consider with regard to bolt-on overall performance.