FMF Racing Yamaha YZ250 1997-98 Fatty PipeThe most copied pipe in the world and #1 best seller for FMF, the Fatty broadens the powerband and provides significant increases throughout. Increases throttle response and enhances over rev Tru Flo stamping process ensures perfect fit Includes O rings FMF Racing Yamaha YZ250 1997 98 Fatty Pipe The most copied pipe in the world and #1 best seller for FMF, the Fatty broadens the powerband and provides significant increases throughout. Increases