FMF Factory 4.1 RCT Titanium Slip-On Exhaust for Yamaha MX Bikes

Unlock professional-grade performance without the premium price tag with FMF’s Factory 4.1 RCT Slip-On Exhaust. Engineered for Yamaha 4-stroke motocross and enduro bikes, this exhaust delivers a noticeable power boost while keeping noise levels in check—ideal for riders who face strict sound regulations or trail restrictions.

Why Choose the 4.1 RCT?

• Resonance Chamber Technology (RCT) refines exhaust flow for smoother power delivery across all RPMs.
• Patented core design maximizes horsepower while reducing decibels—perfect for tracks, trails, and noise-sensitive areas.
• Expanded internal volume absorbs more sound without sacrificing performance, thanks to its innovative canister shape.
• Removable USFS-approved spark arrestor ensures compliance for off-road riding while preventing fire hazards.
• Crash-resistant construction with Factory Forward Engineering keeps the exhaust protected during hard landings.

Built for Performance Riders

Whether you’re racing MX or carving through tight singletrack, the 4.1 RCT slip-on enhances throttle response and mid-range torque. The tuned exhaust core is application-specific, ensuring optimal performance for Yamaha models (compatible with YZ250F, YZ450F, and more). Installation is a breeze, and the modular rear endcap allows quick swaps between tuning tips or spark arrestors.

Upgrade your ride with FMF’s 30+ years of racing expertise—engineered for riders who demand power, durability, and that unmistakable factory sound.

Key Features:

✔ High-performance titanium construction
✔ USFS-approved spark arrestor included
✔ Reduced weight with centralized mass design
✔ Easy-install tuning inserts for custom sound/power tuning

Ideal for: Motocross racers, trail riders, and anyone seeking a pro-level exhaust upgrade without breaking the bank.