Factory 4.1 RCT Slip-On Muffler

Get race-proven performance with smarter sound control. The FMF Factory 4.1 RCT Slip-On Muffler combines lightweight construction with FMF’s RCT (Resonance Chamber Technology) to reduce noise while keeping power output high. It’s designed to improve flow and deliver usable gains across the entire rev range—ideal when you want more performance without breaking sound limits.

Thanks to Factory Forward Engineering, mass is centralized and the muffler is less exposed to crash damage. The innovative rear end cap also makes tuning simple: install tip inserts or a spark arrestor by removing just four screws. With the included QuietCore 94 dB insert and integrated spark arrestor, this slip-on is ready for demanding off-road riding and regulated events.

Key features:

• ✅ RCT Resonance Chamber Technology lowers decibels while maintaining maximum power output
• ✅ Improved internal volume & flow via internal ducts for power gains throughout the range
• ✅ Quick tuning access with an end cap design that simplifies insert/spark arrestor installation

Benefits of use:

• 🔹 More usable power with smoother, better-flowing exhaust performance
• 🔹 Track & race friendly sound—meets AMA and FIM sound requirements
• 🔹 Durable, premium build with titanium body and carbon-fiber end cap, engineered to reduce crash exposure

Technical specifications:

• 📌 Type: Slip-On Muffler
• 📌 Materials: Titanium canister, Carbon Fiber end cap (conical), anodized blue finish
• 📌 Includes: QuietCore 94 dB insert + spark arrestor (in muffler)
• 📌 Brand/Model: FMF Factory 4.1 RCT
• 📌 Vendor part number: 042396
• 📌 Made in U.S.A.

Why choose this product?

• ⭐ Proven FMF off-road performance with a sound-conscious RCT design
• ⭐ Includes the essentials (QuietCore insert + spark arrestor) for compliant riding
• ⭐ Easy to tune and built with premium materials for long-term use