FMF

The FMF Factory 4.1 RCT full exhaust system combines proven race performance with controlled sound output. RCT (Resonance Chamber Technology) improves exhaust flow for stronger power across the entire RPM range while meeting AMA/FIM sound requirements (note: not compliant with 2025 FIM rule).

• RCT patented core lowers dB while maintaining maximum power
• Includes PowerBomb header + QuietCore 94dB insert
• Spark arrestor included; carbon-fiber end cap; Made in the USA

FMF Factory 4.1 RCT Full Exhaust System with MegaBomb design delivers stronger power across the rev range while keeping sound under control. RCT Resonance Chamber Technology helps lower dB without sacrificing performance, and Factory Forward Engineering centralizes mass for better durability.

• RCT patented core shape: lower decibels, maximum output
• Improved internal volume/flow for gains through the entire powerband
• QuietCore 94 dB insert included; AMA/FIM sound requirements (note: not 2025 FIM)

The FMF Factory 4.1 RCT is a high-performance full exhaust system designed to boost power across the entire range while controlling sound. Its patented RCT core and MegaBomb-style header improve exhaust flow, and the included QuietCore insert helps meet track sound limits.

• RCT core design: lower dB with maximum power output
• QuietCore 94 dB insert included; meets AMA/FIM sound requirements*
• Factory Forward Engineering: centralized mass, reduced crash exposure

FMF Factory 4.1 RCT is a race-ready 1-into-1 exhaust system built to centralize mass and reduce crash vulnerability with a shorter overall design. Made from aerospace-grade materials and manufactured in Southern California for high-end performance.

• Resonance Chamber Technology™ (RCT) internal & external
• Stainless-steel pipe with carbon-fiber end cap
• Closed-course competition use only (not 2025 FIM compliant)

FMF Factory 4.1 RCT is a premium race full exhaust system built to improve performance and centralize mass with a shorter overall design. Featuring FMF Resonance Chamber Technology™ and aerospace-grade construction, it’s made for riders who demand factory-level quality.

• Race 1-into-1 full system (closed-course competition use only)
• Titanium pipe & muffler with carbon-fiber end cap
• Shorter length helps reduce crash damage and moves mass closer to the engine

The FMF Factory 4.1 RCT is a premium full exhaust system built for strong power gains across the RPM range with major weight savings. Its shorter design helps reduce crash damage and centralizes mass by moving the muffler closer to the engine.

• Includes MegaBomb header + spark arrestor screen insert
• RTS Rapid Tuning System and FMF Resonance Chamber Technology™ (internal & external)
• Premium materials: aluminum muffler, stainless steel pipe, carbon fiber end cap (94dB insert included)