FMF Factory 4.1 Exhausts

The FMF Factory 4.1 Exhaust lineup represents the pinnacle of motocross and off-road exhaust technology. Engineered with FMF’s proprietary Resonance Chamber Technology (RCT), these systems deliver massive power gains across the RPM range, enhanced throttle response, and significant weight savings over stock components .

Constructed from aerospace-grade titanium or lightweight aluminum, the Factory 4.1 systems feature carbon fiber end caps and a blue anodized finish, offering both performance and a factory race team aesthetic . The Rapid Tuning System (RTS) allows for quick and easy insert changes, including a U.S. Forestry-approved spark arrestor, making these exhausts versatile for various riding conditions .

Key Features:

• Resonance Chamber Technology (RCT): Enhances exhaust pressure for optimal power output while reducing sound levels.

• Lightweight Construction: Titanium and aluminum options provide significant weight reduction compared to stock systems.

• Rapid Tuning System (RTS): Allows for easy tuning adjustments and insert changes.

• Versatility: Compatible with both FMF and OEM headers, suitable for various models and riding styles.

• Proven Performance: Trusted by top riders in AMA Supercross, Motocross, and FIM Motocross of Nations.

Whether you're aiming to improve lap times on the track or enhance your off-road adventures, the FMF Factory 4.1 Exhaust Systems offer the performance and reliability that serious riders demand.

Shop now at BTO Sports to experience the difference that a premium exhaust system can make in your riding performance.