The Factory Fatty is 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 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 APPLICATIONS Make Model Year BETA 250RR 20-25 BETA 300RR 20-25 BETA 300RX 21-25 Fits: BETA RR250 2T 2020-2021 RR300 2T 2020-2021 RR300 Racing 2T 2017-2021 Beta RR 2T 250 2023 RR 2T 300 2023