The FMF Factory 4.1 RCT Exhaust System (Full System) is built for riders who want real performance gains without an overly loud bike. Using FMF’s RCT (Resonance Chamber Technology), the patented core shape is designed to reduce sound levels while maintaining maximum power output—making it a smart upgrade for track and off-road riding where performance and sound limits both matter.
Inside the RCT chambers, integrated ducts increase internal volume to improve exhaust flow, helping deliver power gains throughout the entire RPM range. FMF’s Factory Forward Engineering also centralizes mass, improving handling feel and making the system less prone to crash damage. An innovative rear end cap allows quick installation of tuning tip inserts or a spark arrestor by removing just four screws, so you can adapt your setup to conditions and regulations.
Key features:
✅ RCT patented core shape lowers decibels while maintaining maximum power output
✅ Internal ducting increases volume for improved flow and power gains across the entire range
✅ Factory Forward Engineering centralizes mass and reduces crash-damage risk
Benefits of use:
🔹 Strong, usable performance improvements from low to high RPM—not just at peak power
🔹 More controlled sound output for riding areas and events with noise restrictions
🔹 Easy tuning/spark arrestor compatibility thanks to the quick-access rear end cap design
Technical specifications (key info):
📌 Type: Full System (single canister)
📌 Materials: Titanium pipe & muffler; carbon fiber end cap (blue anodized muffler finish)
📌 Included: QuietCore 94 dB insert
Why choose this product/service?!
⭐ Proven FMF Factory-series performance with RCT sound-management technology
⭐ Meets AMA and FIM sound requirements (NOTE: will not pass 2025 FIM sound regulation)
⭐ Made in the U.S.A. with a design focused on durability, serviceability and race-ready results
