FACTORY FATTY: Reminiscent of the works or cone pipe once used by Factory Teams. It shares many of the same characteristics with its craftsmanship and material quality. The Factory Fatty broadens and smoothes out the power curve while boosting gains throughout the entire power band, more low-end, more mid, and increased over-rev. No matter what type of riding you do, the Factory Fatty has the benefits youre looking for. Lighter 20 gauge steel used for the body of the pipe 19 Gauge steel used for the header portion Includes O-rings on most models Hand pounded seams for smooth flow transitions O-Rings included Make Model Year BETA 250RR 13-19 BETA 300RR 13-19 Fits: BETA RR250 2T 2013-2019 RR250 Racing 2T 2017-2019 RR300 2T 2013-2018