Yoshimura RS-4D Signature Series Full Exhaust System

Item Number: 338946


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Product Description


Yoshimura RS-4D Signature Series Full Exhaust System

Yoshimura Signature Series exhaust components are the answer for riders faced with ever-tightening noise and emissions regulations at the federal level. All Signature Series components are independently tested, documented, and marked as required by state and federal regulations as CARB/EPA-compliant.

The absolute pinnacle of Yoshimura's offroad exhaust systems comes in the form of the RS-4D exhaust system. It builds on the technology that made the RS-4 systems incredibly successful on the racetrack and while enhancing its already exceptional performance.

The RS-4D boasts a unique dual-outlet design that increases the amount of open area at the exhaust outlet. With dual internal baffles, the RS-4D increases the exhaust gas flow rate, resulting in smoother power delivery and increased throttle control. It also offers increased horsepower and torque throughout the power curve, especially in the bottom to mid-RPM range where riders need it most.

  • Unique dual-outlet carbon fiber end-cap
  • Dual internal baffles for more exhaust flow
  • Pentagonal-shaped sleeve
  • Front muffler cap functions as a polyresonant chamber which helps reduce noise
  • Titanium header and tail-pipe
  • Low-volume inserts included
  • Includes instructions and all required installation hardware
  • 80dB EPA noise emissions compliant

Spec Details
CARB Approved Yes
Country of Origin USA
Header Construction Titanium
Muffler End Cap Carbon Fiber
Muffler Sleeve Varies (make selection above)
USFS Spark Arrestor No

Vehicle Fitment

Fitment is guaranteed or your money back plus free return shipping. Don't waste time installing a product that doesn't fit. We worked hard ensuring that this product is an exact fit on the vehicles listed below.


  • CRF250R 2011-2013
  • CRF450R 2011-2012

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