FMF Fatty Exhaust Pipes – More Usable Power for Motocross

FMF Fatty exhaust pipes are a performance upgrade for 2-stroke motocross bikes, designed to improve engine power delivery throughout the rev range. The Fatty pipe broadens and smooths out the powerband while adding more usable power in the mid and upper RPM range. The result is a more linear and controllable engine character: throttle response is improved, traction is easier to manage under acceleration, and the engine pulls further before shifting. The pipe provides increased mid-range torque and improved high-RPM performance, making the engine’s power delivery smoother and easier to take advantage of on the track.

The FMF Fatty and Factory Fatty exhaust pipes are based on the same concept of delivering stronger and more consistent power, but differ in construction and finish. The traditional Fatty model is made from carbon steel and features a nickel-plated finish for improved durability and corrosion resistance. The Factory Fatty is inspired by the race pipes used by factory teams, featuring a lighter construction and race-inspired finish. The Factory Fatty is designed especially for riders looking for maximum performance and a construction suited to competitive racing.

The FMF Fatty is an excellent choice for riders who want more usable power from their motocross bike. The pipe improves throttle response, strengthens mid-range pull and helps the engine continue to perform effectively at higher RPM. The result is a broader and more usable powerband that provides an advantage particularly under acceleration, exiting corners and on faster sections of the track.

FMF Fatty exhaust pipes are not EC-approved and are intended for competition use only.