FMF Factory 4.1 RCT Slip-On Muffler (Blue Titanium / Carbon Fiber) 044466 - Yamaha WR450F 2020-2021

Product Description

Upgrade your dirt bike's exhaust performance with the FMF Factory 4.1 RCT Slip-On Muffler, featuring patented Resonance Chamber Technology (RCT) for maximum power output and lower decibels. Designed with FMF's Factory Forward Engineering, it centralizes mass to make it less prone to crash damage while delivering power gains across the entire rpm range.

Constructed from lightweight blue anodized titanium and finished with a striking carbon fiber end cap, this muffler meets AMA and FIM sound requirements. It includes both a QuietCore 94 dB insert and a spark arrestor for versatile off-road and trail compliance.

Top Features: FMF Factory 4.1 RCT Slip-On Muffler

• RCT (Resonance Chamber Technology) uses a patented core shape to reduce decibels while maintaining maximum power.
• Internal chamber ducts increase internal volume for improved exhaust flow and total power gains.
• Factory Forward Engineering centralizes mass to reduce vulnerability to crash damage.
• Innovative carbon fiber end cap allows simple installation of tuning tips or spark arrestors by removing four screws.
• Meets official AMA and FIM sound requirements, and includes a QuietCore 94 dB insert and spark arrestor.

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 compatible with the stock header pipe?
A: Yes, the Factory 4.1 RCT slip-on is fully compatible with either the stock factory header or an aftermarket FMF header.

Q: Does the muffler include a spark arrestor and sound insert?
A: Yes, it comes equipped with both a spark arrestor and a QuietCore 94 dB insert.

Expert Pro-Tag: When installing a titanium slip-on muffler, ensure the mid-pipe slip joint is free of dirt and old sealant. Applying a light coat of high-temperature silicone sealant to the joint during assembly prevents exhaust leaks and helps maintain proper backpressure.

Recommended Pairings:

• Yamaha 4-Stroke Performance Parts & Upgrades
• Silencer Maintenance Parts
• Motorcycle Tools[cite: 1]

At Moto-House MX, we carry the best brands in motocross and off-road performance. Our team has over 40 years of experience helping riders get more out of their machines. We pride ourselves on great customer service, and every item ships FAST - straight to your door[cite: 1].

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