FMF Factory 4.1 RCT Complete System (Yamaha)

The FMF Factory 4.1 RCT Complete System is FMFs top-shelf four-stroke exhaust, engineered for Yamaha riders who want maximum power, minimal weight, and true factory performance. It features FMFs exclusive Resonance Chamber Technology (RCT) both internal and external which smooths out exhaust flow, boosts torque, and expands usable power across the rpm range. Combined with FMFs Factory Forward Engineering, the system positions the muffler closer to the motor for better mass centralization and handling.

Built entirely from aerospace-grade materials, the Factory 4.1 RCT offers huge power gains while cutting significant weight compared to stock. The shorter overall length not only improves balance and handling but also reduces the risk of damage in crashes. Every system is hand-built in FMFs Southern California facility to race-level precision, complete with a MegaBomb header for even broader power delivery and a spark arrestor insert for versatility.

Why We Like It:
Its FMFs most refined and aggressive setup powerful, light, and tuned perfectly for modern Yamaha four-strokes. The sound is deep and clean, the throttle response is instant, and the whole system looks pure factory with that carbon fiber end cap.

Why Itll Work for You:
This exhaust gives your Yamaha more power everywhere stronger low-end grunt, a smoother midrange, and better pull on top. Its lighter than stock, improves throttle response, and centralizes weight so your bike feels more agile. Plus, the included spark arrestor makes it ready for both race days and trail rides.

Variants / Options:
Available in Natural Aluminum with Carbon Fiber End Cap. Includes MegaBomb header and spark arrestor screen insert.

Key Features:

• FMF Resonance Chamber Technology (internal & external)

• Factory Forward Engineering for better mass centralization

• Aerospace-grade stainless and aluminum construction

• Shorter, crash-resistant muffler design

• Massive power gains across the rpm range

• Huge weight savings over stock

• New RTS (Rapid Tuning System) for easy maintenance

• Includes MegaBomb header and spark arrestor insert

• Handcrafted in Southern California, USA