FMF Racing Factory Fatty Pipe for Yamaha YZ125 05-21/YZ125X 20-22FMF Factory Fatty Pipe Yamaha YZ125 YZ125X The FMF Factory Fatty Exhaust is reminiscent of the works or custom cone pipes once used by Factory Teams when two strokes ruled the dirt. It shares many of the same characteristics with its factory works predecessors including the craftsmanship and material quality. Constructed with two thicknesses of high quality carbon steel, the lower portion is comprised of 19 gauge steel for optimum strength and