The FMF Factory 4.1 RCT Exhaust System is designed for riders who want strong, usable power gains without sacrificing sound control. Thanks to patented RCT (Resonance Chamber Technology), the system lowers decibels while still delivering maximum power output—ideal when you need performance that remains track- and trail-friendly.
Internal ducting increases the system’s chamber volume to improve exhaust flow, helping produce power gains throughout the entire power range. FMF’s Factory Forward Engineering also centralizes mass to reduce the chance of crash damage and keep the bike feeling more balanced. Tuning is quick and straightforward as well: the innovative rear end cap allows easy installation of tuning tip inserts or the spark arrestor by removing just four screws.
Key features:
✅ Patented RCT core shape reduces sound while maintaining power
✅ Increased internal volume and improved flow for broad-range power gains
✅ Factory Forward Engineering helps centralize mass and improve durability
Benefits:
🔹 More responsive power delivery across the rev range for faster exits and stronger pull
🔹 Track-ready sound control with the included QuietCore 94 dB insert
🔹 Easy service and tuning access plus a spark arrestor included for off-road requirements
Technical specifications:
📌 Type: Full system (single canister)
📌 Header: FMF PowerBomb
📌 Materials: Titanium pipe/muffler, carbon-fiber end cap; anodized blue finish
📌 Included: QuietCore 94 dB insert, spark arrestor in muffler
📌 Compliance note: Meets AMA and FIM sound requirements, but will not pass 2025 FIM sound regulation
Why choose this product?
⭐ Premium FMF engineering focused on real-world performance and controlled sound
⭐ Made in the U.S.A. with high-end titanium and carbon components
⭐ Great all-in-one upgrade: full system + insert + spark arrestor included
