FMF Exhaust S/S Pipe - KTM 125 SX 04-10FMF Exhaust S S Pipe KTM 125 SX 04 10 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 you're looking