FMF Factory 4.1 RCT Slip-On Muffler 044453 — Yamaha YZ250F / YZ250FX / WR250F 2019-2026

Product Description

The FMF Factory 4.1 RCT Slip-On Muffler is the ultimate performance upgrade for your Yamaha 250cc machine. Utilizing FMF's patented Resonance Chamber Technology (RCT), this exhaust system features a sophisticated core shape that effectively lowers decibel levels while maximizing power output. The internal ducting system increases exhaust volume for improved flow, delivering significant power gains throughout the entire RPM range.

Designed with Factory Forward Engineering, the muffler is positioned closer to the engine to centralize mass, significantly improving your bike's handling and protecting the unit from crash damage. Built with a durable stainless steel/aluminum canister and a premium carbon fiber end cap, this muffler is lightweight and built to withstand the rigors of racing. Each unit includes a QuietCore 94 dB insert and a spark arrestor, ensuring performance for the track and compliance for the trails.

Top Features: FMF Factory 4.1 RCT Slip-On

• Resonance Chamber Technology (RCT) provides maximum power with lower decibels
• Factory Forward Engineering centralizes mass for better handling and durability
• Lightweight aluminum/stainless steel canister with a premium carbon fiber end cap
• Includes QuietCore 94 dB insert and spark arrestor for trail versatility
• Compatible with your stock header or an upgraded FMF performance header
• Proudly made in the U.S.A. and meets AMA/FIM sound standards

Please review the detailed compatibility data below to ensure an exact fitment match for your motorcycle before finalizing your purchase.

Fitment List

Frequently Asked Questions

Q: Is this muffler difficult to install?
A: No, the 4.1 RCT slip-on is designed to bolt directly onto your stock mounting points and header, making for a straightforward installation process.

Q: How often should I check the spark arrestor?
A: If you ride in environments that require spark arrestors, we recommend checking the mesh screen periodically for any debris or buildup to maintain optimal flow.

Expert Pro-Tip: To maximize the life of your FMF exhaust, keep a close eye on the muffler packing. When the exhaust note starts to get significantly louder, it's time for a repack. Fresh packing keeps your power consistent, protects your canister from excess heat, and ensures you stay well within track sound requirements.

Recommended Pairings:
o Yamaha 4-Stroke Performance Parts & Upgrades
o Essential Motorcycle Tools
o Premium Motorcycle Chemicals & Lubricants

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