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 for.
Bike Fitment: Yamaha 1999-2015 YZ250
Same shaped cone sections as the popular Fatty pipe.
Factory Fatty is constructed with 2 different thicknesses of US steel.
19-gauge steel for the header portion for optimum strength and durability.
20-gauge steel for the body and rear cone section for increased weight savings.
The thinner steel yields a slight increase in power when compared to thicker materials due to more efficient wear resonance.
Seams are hand pounded after the stamping process.