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

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

The FMF Factory 4.1 RCT Slip-On Exhaust delivers factory-level power, tone, and craftsmanship to your Yamaha. Designed with FMF’s Resonance Chamber Technology™ (RCT) both inside and out, this system smooths exhaust flow, boosts torque and horsepower, and fine-tunes sound control for a crisp, deep tone. The result is more usable power across the rpm range — perfect for everything from track days to off-road competition.

With Factory Forward Engineering, FMF moves the muffler closer to the engine to centralize mass, improving handling and reducing the chance of crash damage. Built from aerospace-grade aluminum with a stainless steel mid pipe, the 4.1 RCT offers strength, reliability, and significant weight savings over stock. The carbon fiber end cap adds a clean factory finish, while the Rapid Tuning System (RTS) makes insert swaps and maintenance fast and easy. Each system comes ready to ride with both a spark arrestor screen insert and a 94dB quiet insert included.

Why We Like It:
It’s a perfect blend of power and control — a race-proven design that wakes up your Yamaha without being too loud. The aluminum and stainless combo keeps it light yet tough, while the carbon end cap gives it that premium FMF look.

Why It’ll Work for You:
This slip-on gives your Yamaha more torque and smoother throttle response right away. It’s lighter, more responsive, and easy to maintain — a direct bolt-on upgrade that delivers real results and long-lasting performance.

Variants / Options:
Available in Natural Aluminum with Carbon Fiber End Cap. Compatible with FMF or OEM headers.

Key Features:

• Resonance Chamber Technology™ (RCT) for power and noise control
  
  

• Factory Forward Engineering centralizes weight for better handling
  
  

• Aerospace-grade aluminum canister with stainless steel mid pipe
  
  

• Carbon fiber end cap for lightweight durability and factory styling
  
  

• Rapid Tuning System (RTS) allows easy tuning insert changes
  
  

• Significant power gains throughout the rpm range
  
  

• Includes spark arrestor screen insert and 94dB quiet insert
  
  

• Weighs only 7.1 lbs.
  
  

• Closed-course use only
  
  

• Handcrafted in Southern California, USA