The Factory 4.1 is FMF Racing's premier performance exhaust. With 30 years of racing experience behind it, the Factory 4.1 takes advantage of everything they have learned on the race track. The Factory 4.1 is guaranteed to produce more horsepower throughout the entire RPM range. More power means better starts and less work getting around the track. Reduced weight means better handling resulting in less fatigue at the end of a moto. If performance is your priority, the Factory 4.1 is the only exhaust for you.

Fits 2015 to 2017 models