Factory 4.1 RCT Exhaust System

Unlock race-proven performance with the FMF Factory 4.1 RCT Exhaust System. Built using FMF’s aerospace-grade materials and manufactured in Southern California, this system is designed for riders who want a lighter, stronger exhaust with a purpose-built race feel. FMF’s RCT (Resonance Chamber Technology™) is incorporated both internally and externally to help deliver a crisp, responsive power character while managing sound output more effectively than a basic muffler design.

Thanks to its shorter overall length, the Factory 4.1 RCT is less exposed in a crash and better complements modern chassis layouts by moving the muffler closer to the motor for improved mass centralization. For riders who need flexibility, it ships with a spark arrestor screen insert and a 94 dB insert to better suit different riding areas and noise requirements.

Key features:

• ✅ Incorporates FMF Resonance Chamber Technology™ both internally and externally
• ✅ Shorter length to reduce crash susceptibility and help centralize mass
• ✅ Aerospace-grade construction, manufactured 100% in FMF’s Southern California facility

Benefits of use:

• ▹ More race-focused performance and throttle response compared with stock-style exhausts
• ▹ Improved durability and reduced risk of impact damage thanks to the compact design
• ▹ Added versatility with included spark arrestor screen and 94 dB insert

Technical specifications:

• 📌 Brand: FMF
• 📌 Model: Factory 4.1 RCT
• 📌 Pipe material: Titanium
• 📌 End cap material: Carbon Fiber (black finish)
• 📌 Muffler finish: Anodized Blue
• 📌 Type: Race
• 📌 Includes: Spark arrestor screen insert, 94 dB insert
• 📌 Intended use: Closed course competition only
• 📌 Note: Will not pass 2025 FIM sound regulation

Why choose this exhaust system?

• ⭐ Premium, race-driven construction with proven FMF engineering
• ⭐ Designed to be lighter, compact, and more impact-resistant than longer systems
• ⭐ Supplied with key inserts so you can tailor it to your riding environment