FMF Factory 4.1 RCT Exhaust System for Yamaha Dirt Bikes

Engineered for riders who demand peak performance without compromise, the FMF Factory 4.1 RCT exhaust system combines cutting-edge acoustics with race-proven durability. Designed specifically for Yamaha off-road and motocross bikes, this system features proprietary Resonance Chamber Technology™ to optimize exhaust flow while reducing sound levels—perfect for tracks with strict noise regulations (94dB compliant).

Why Choose the Factory 4.1 RCT?

• Aerospace-Grade Build: Handcrafted in California using high-grade materials for unmatched longevity under extreme conditions.
• Crash-Resistant Design: Shorter canister placement (“Factory Forward Engineering”) protects the exhaust from impacts and improves bike balance.
• Smart Acoustics: Patented core and chamber designs reduce noise without sacrificing horsepower—ideal for competitive racers and trail riders.
• Easy Customization: Swap tuning tips or install a spark arrestor in seconds with the innovative rear endcap.

Performance You Can Feel

The RCT system’s tuned exhaust core delivers precise backpressure control, maximizing low-end torque for quicker throttle response—whether you’re tackling tight trails or launching out of corners.

Ideal For: Yamaha YZ250F/450F, WR250F/450F, and other models needing a lightweight, high-performance upgrade.

Upgrade your ride with FMF’s precision engineering—where power meets refinement.
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