Yoshimura - RS-9T Full System (Honda)

Yoshimura – RS-9T Full System (Honda)

Developed hand-in-hand with Honda HRC’s factory engineers, the Yoshimura RS-9T Full System is a precision-built exhaust designed to maximize performance, mass centralization, and rideability for modern Honda four-strokes. From the track to the dyno, this system was tested and refined by Yoshimura and HRC to deliver smoother, more controllable power and sharper throttle response across the entire rpm range.

The RS-9T’s dual tapered muffler design is tucked forward and closer to the frame for a lower center of gravity, improving handling and balance. A 3-stage header enhances exhaust scavenging for broader power, while a new tail-pipe divider equalizes pressure between both mufflers, smoothing flow and increasing velocity. The result is a more tractable feel — stronger off the bottom, cleaner through the mid, and improved pull up top. Each system is built with a stainless steel header and tail pipe for durability and performance consistency.

Why We Like It:
It’s pure factory tech straight from Honda’s race program. The RS-9T delivers smooth, predictable power, a lower noise level, and that signature Yoshimura tone. It makes your CRF feel more planted, balanced, and explosive all at once.

Why It’ll Work for You:
This exhaust boosts usable torque and throttle response while improving overall handling through better mass centralization. The forward-mounted dual mufflers not only help performance but also reduce crash vulnerability. The larger canister volume keeps the tone deep and clean while meeting sound limits — perfect for serious racers or riders chasing that factory feel.

Variants / Options:
Fits modern Honda CRF450R and CRF450RX models. Works with or without Honda’s electric start system.

Key Features:

• Developed with Honda HRC and American Honda MX teams
  
  

• Dual RS-9T tapered muffler design for improved mass centralization
  
  

• 3-stage header increases torque and throttle response
  
  

• Tail-pipe divider smooths exhaust flow between mufflers
  
  

• Larger muffler cores reduce noise and boost mid-to-top power
  
  

• Stainless steel header and tail pipe for strength and durability
  
  

• Tested and proven on track and dyno by Yoshimura and Honda R&D Japan
  
  

• Works with both electric and kick-start models