Factory Fatty 025319 YAMAHA-YZ65-2024 -Less sound equals more ground

-Less sound equals more ground

With its lightweight extruded aluminum oval canister mated to a perforated core

American Fire Power

1 is the ultimate upgrade for your bike

You can pay an engine builder thousands or bolt on a Megabomb for as much as a 3hp boost

Factory Fatty 025319 YAMAHA-YZ65-2024 -Less sound equals more groundThe 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