FMF - Factory 4.1 RCT Titanium Slip-On Exhaust (Husqvarna)

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

The FMF Factory 4.1 RCT Slip-On brings full factory performance to Husqvarna’s latest four-strokes. Designed and hand-built in Southern California, this system uses FMF’s Resonance Chamber Technology™ (RCT) — both internally and externally — to smooth power delivery, control sound, and maximize horsepower throughout the entire rpm range. Combined with FMF’s Factory Forward Engineering, the 4.1 RCT positions the muffler closer to the engine for centralized mass and better handling on the track.

Built entirely from aerospace-grade titanium, including the titanium mid pipe, this slip-on offers massive weight savings while maintaining incredible durability. The blue anodized finish with a carbon fiber end cap gives it that true factory look, while the included spark arrestor screen and 94dB quiet insert make it versatile for both race and off-road use. The shorter overall length reduces the risk of crash damage, and FMF’s new Rapid Tuning System (RTS) allows for easy insert swaps and maintenance.

Why We Like It:
It looks like it came straight off a factory race bike — light, clean, and aggressive. The 4.1 RCT adds smooth, usable power across the board and gives your Husky that deep, refined tone FMF is known for.

Why It’ll Work for You:
This slip-on improves throttle response and overall engine performance without adding weight or complexity. The titanium build keeps your bike light and responsive, while the carbon fiber end cap and resonance chamber reduce noise without restricting flow. It’s the perfect upgrade for riders who want real performance gains and race-proven craftsmanship.

Variants / Options:
Available in Blue Anodized Titanium with Carbon Fiber End Cap. Compatible with select Husqvarna four-stroke models.

Key Features:

• FMF Resonance Chamber Technology™ (RCT) for smoother power and controlled sound
  
  

• Factory Forward Engineering improves handling through centralized mass
  
  

• Full titanium construction, including mid pipe, for extreme weight savings
  
  

• Blue anodized finish and carbon fiber end cap for true factory style
  
  

• Rapid Tuning System (RTS) for quick insert changes
  
  

• Includes spark arrestor screen and 94dB quiet insert
  
  

• Shorter, crash-resistant muffler design
  
  

• Weight: 4.2 lbs
  
  

• Handcrafted in Southern California, USA
  
  

• Closed-course use only