FMF Factory 4.1 Slip-On Exhaust | 041589 dirt Seal Drivers: 33

Seal Drivers: 33

Fitment: use w/ stock header

yet light and portable enough to take to the track or favorite riding spot

World Off-road Championship Series (WORCS) & Desert Racing (DR)

Used exclusively by the Yamaha Offroad Race Team for the past 15 racing seasons

FMF Factory 4.1 Slip-On Exhaust | 041589 dirt Seal Drivers: 33All new incorporating the latest in Resonance Chamber Technology Patented core shape lowers sound level while maintaining maximum power output Patented canister shape increases internal volume for more sound absorbing material Patented chamber design to enhance and refine exhaust pressure Factory Forward Engineering centralizes mass and is less prone to crash damage Tuned exhaust with optimized core specifications for each application Innovative rear