FMF Factory Fatty Exhaust Pipe

The FMF Factory Fatty exhaust pipe (also called the Factory Fatty expansion chamber or 2-stroke pipe) is a bolt-on performance upgrade for two-stroke motorcycles and powersports machines. It takes its design from the "works" cone pipes that factory race teams once ran. It is built to smooth and broaden the power curve.

Key Features:

• Two-stroke exhaust pipe designed to add low-end, mid-range and over-rev power
• Lighter 20-gauge steel body paired with a heavier 19-gauge steel header section
• Unplated carbon steel construction with a raw factory look
• Hand-pounded seams for smooth flow transitions
• Produces a broader, more tractable powerband with better throttle control
• O-rings included
• Made in the USA

Developed and tested with top racers, the Factory Fatty offers works-style technology to the public. It is a popular first step for riders who want more usable power from a two-stroke. Some pipes may have factory indentations that provide installation clearance.