FMF - Factory 4.1 RCT Titanium Slip-On Exhaust w/Mid Pipe (Gas Gas)

FMF – Factory 4.1 RCT Slip-On Muffler with Titanium Mid Pipe (GasGas)

The FMF Factory 4.1 RCT Slip-On Muffler is pure factory engineering tailored for GasGas performance. Built with FMF’s exclusive Resonance Chamber Technology™ (RCT) both inside and out, this system smooths exhaust flow, sharpens throttle response, and delivers a broader power curve across the entire rpm range. It’s designed to make your GasGas lighter, faster, and more responsive while maintaining that deep, clean FMF tone.

Constructed entirely from aerospace-grade titanium, the Factory 4.1 RCT features a Blue Anodized Titanium canister, carbon fiber end cap, and Titanium mid pipe for unbeatable strength and weight reduction. FMF’s Factory Forward Engineering moves the muffler closer to the motor for better balance and handling, while the shorter overall length makes it more resistant to crash damage. With the Rapid Tuning System (RTS) and included 94dB insert and spark arrestor, this slip-on gives you full control over your sound and setup.

Why We Like It:
It’s lightweight, responsive, and race-proven — everything a GasGas exhaust should be. The titanium build not only looks incredible but also frees up power while keeping noise levels dialed. You can feel the throttle snap and midrange pull instantly.

Why It’ll Work for You:
This slip-on adds serious performance without the hassle of a full system. You’ll notice stronger power delivery across the rpm range, better throttle feel, and improved handling from the centralized weight. Plus, with the included inserts, it’s easy to switch between race-day performance and trail-ready compliance.

Variants / Options:
Available in Blue Anodized Titanium with Carbon Fiber End Cap. Compatible with FMF or OEM headers.

Key Features:

• FMF Resonance Chamber Technology™ (RCT) for enhanced torque and sound control
  
  

• Factory Forward Engineering centralizes mass for better balance
  
  

• Titanium construction throughout: canister and mid pipe
  
  

• Blue anodized finish with carbon fiber end cap for factory style
  
  

• Rapid Tuning System (RTS) for easy insert and maintenance changes
  
  

• Massive power gains throughout the rpm range
  
  

• Huge weight savings – just 6.4 lbs. total
  
  

• Includes spark arrestor screen and 94dB quiet insert
  
  

• Closed-course use only
  
  

• Handcrafted in Southern California, USA