The FMF Factory 4.1 RCT Slip-On Muffler is designed for riders who want a high-performance, competition-focused exhaust upgrade with smart packaging and premium construction. By integrating FMF Resonance Chamber Technology™ both internally and externally, it helps deliver strong performance while maintaining a refined, race-proven design.
Its shorter overall length makes the muffler less exposed in crashes and works with Factory Forward Engineering by moving the muffler closer to the motor—helping to centralize mass for a more responsive feel on the track or trail.
Key features:
✅ RCT Resonance Chamber Technology™ integrated internally and externally
✅ Compact design for improved crash resistance and mass centralization
✅ Aerospace-grade materials, manufactured 100% in Southern California
Benefits of use:
🔹 More protected, shorter muffler design—less likely to take damage in a tip-over
🔹 Mass moved closer to the engine for improved handling feel and balance
🔹 Premium materials and U.S. manufacturing for long-term durability and performance
Technical specifications (when needed):
📌 Type: Slip-On muffler
📌 Muffler material/finish: Aluminum, anodized gray
📌 End cap: Carbon fiber, black
📌 Pipe material: Stainless steel
📌 Brand: FMF
📌 Vendor part number: 042411
📌 Note: For closed course competition use only
Why choose this product/service?
⭐ Race-proven FMF quality with advanced RCT design
⭐ Built from aerospace-grade materials to exacting specifications
⭐ A smart performance upgrade with a compact, crash-conscious layout
