FMF Factory 4.1 RCT Slip-On – Race-Proven Power. Factory-Level Engineering.
Take your bike’s performance to the next level with the FMF Factory 4.1 RCT Slip-On Exhaust, engineered with the latest advancements in Resonance Chamber Technology (RCT). Designed for serious riders and racers, this premium slip-on system delivers refined power output, centralized mass, and race-ready durability—while maintaining easy installation and serviceability.
Built from premium materials and application-specific tuning, the Factory 4.1 RCT sets the standard for high-performance exhaust upgrades.
Key Features:
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Resonance Chamber Technology (RCT)
Incorporates FMF’s patented internal chamber design to enhance exhaust pressure, smooth out power delivery, and increase throttle response. -
Factory Forward Engineering
Strategically places the muffler closer to the engine to centralize mass and reduce crash vulnerability—ideal for competitive riding and motocross. -
Application-Tuned Performance
Each system is engineered with optimized core specs to match your bike’s displacement and power characteristics, ensuring maximum gains. -
Versatile Rear End Cap
Allows for quick installation of tuning tip inserts or spark arrestors, giving riders flexibility in meeting race or trail requirements. -
Premium Construction Options
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Ti RCT: Features a lightweight titanium canister and mid-pipe for top-tier performance
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Aluminum RCT: Offers an aluminum canister paired with a durable stainless steel mid-pipe for value-driven durability
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Includes Spark Arrestor and Wash Plug
Ready for off-road use with included USFS-approved spark arrestor and wash plug for easy maintenance.
Built for Riders Who Demand More
Whether you're chasing podiums or carving singletrack, the FMF Factory 4.1 RCT Slip-On gives your bike the edge it needs—delivering aggressive sound, increased horsepower, and a noticeable upgrade in throttle control.
Upgrade your exhaust. Unlock your bike’s potential with FMF Factory 4.1 RCT Slip-On performance.