The FMF Factory 4.1 RCT Full Exhaust System is built for riders who want stronger, more usable power without sacrificing sound control or durability. Thanks to RCT (Resonance Chamber Technology), the system uses a patented core shape that reduces decibels while maintaining maximum power output—ideal for tracks and events with strict sound limits.
Inside the RCT chambers, internal ducts increase system volume and improve exhaust flow, delivering power gains throughout the entire RPM range. FMF’s Factory Forward Engineering also helps centralize mass and keeps the system less exposed, making it a smarter choice for aggressive motocross and enduro riding where crashes and impacts happen.
Key features:
✅ RCT patented core: lowers sound output while keeping strong performance
✅ Improved internal volume & flow: power gains across the whole powerband
✅ Service-friendly end cap: easy tuning tip or spark arrestor installation (4 screws)
Benefits of use:
🔹 More rideable power: improved flow for stronger pull across low, mid and top RPM
🔹 Track-ready sound control: includes QuietCore insert for easier compliance*
🔹 Built to last: premium materials and forward-positioned design help reduce damage risk
Technical specifications:
📌 Brand: FMF
📌 Model: Factory 4.1 RCT
📌 Type: Full System (Single canister)
📌 Style: MegaBomb
📌 Pipe material: Stainless steel
📌 Muffler material: Aluminum
📌 End cap: Carbon fiber
📌 Included: QuietCore 94 dB insert
📌 Made in: U.S.A.
Why choose this exhaust system?
⭐ Proven FMF race-bred performance with sound-conscious RCT technology
⭐ Quick, practical tuning/spark arrestor compatibility via the rear end cap design
⭐ A premium full system upgrade for riders who want performance, compliance and durability in one package
*Note: Listed as meeting AMA and FIM sound requirements, however it will not pass 2025 FIM sound regulation.
