FMF - Factory 4.1 RCT Aluminum Slip-On Exhaust w/Stainless Mid Pipe (Kawasaki)

FMF – Factory 4.1 RCT Aluminum Slip-On Exhaust with Stainless Mid Pipe (Kawasaki)

The FMF Factory 4.1 RCT Slip-On is the perfect blend of factory-level engineering and everyday durability. Designed specifically for Kawasaki’s modern four-strokes, it features FMF’s Resonance Chamber Technology™ (RCT) — both internal and external — to smooth exhaust flow, boost power, and refine sound. Combined with FMF’s Factory Forward Engineering, this system positions the muffler closer to the engine for better balance and improved mass centralization, giving you a more responsive, better-handling bike.

Built with a natural aluminum canister and a stainless steel mid pipe, the Factory 4.1 RCT is tuned for performance, longevity, and weight savings. The carbon fiber end cap completes the race-ready look, while FMF’s Rapid Tuning System (RTS) makes insert swaps and maintenance a breeze. With a spark arrestor screen and 94dB quiet insert included, this system gives you flexibility for both closed-course racing and trail riding.

Why We Like It:
It’s a race-proven design that delivers serious power gains without sacrificing durability. The aluminum and stainless construction keeps it strong and affordable, while still offering that crisp, deep FMF tone every rider loves.

Why It’ll Work for You:
This slip-on gives your Kawasaki more power across the entire rpm range — with better throttle response and smoother torque delivery. It’s lighter than stock, easier to maintain, and comes ready to ride with both spark arrestor and quiet inserts. Whether you’re racing or ripping trails, it’s an easy bolt-on upgrade that instantly improves your bike’s performance.

Variants / Options:
Available in Natural Aluminum with Carbon Fiber End Cap. Compatible with Kawasaki four-stroke motocross and off-road models.

Key Features:

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

• Factory Forward Engineering centralizes mass for better handling
  
  

• Natural aluminum canister with carbon fiber end cap
  
  

• Stainless steel mid pipe for long-term durability
  
  

• Rapid Tuning System (RTS) for easy insert changes
  
  

• Includes spark arrestor screen and 94dB quiet insert
  
  

• Significant power gains throughout the rpm range
  
  

• Weight: 7.1 lbs
  
  

• Handcrafted in Southern California, USA
  
  

• Closed-course use only