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Yoshimura - Pro Series RS-4D Exhaust System (Kawasaki)

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Yoshimura - Pro Series RS-4D Exhaust System (Kawasaki)

The RS-4 muffler was developed in conjunction with the Rockstar Makita Suzuki Yoshimura race team with one purpose in mind: winning championships. That goal was accomplished during the 2010 AMA Supercross and Motocross season, as Ryan Dungey and his Yoshimura powered RM-Z450 shook the motocross world by being the first rookie in the history of the sport to dominate both series. The new RS-4D builds on the technology that has made the RS-4 a force to be reckoned with on the racetrack, enhancing it's rock solid performance. By increasing the amount of open area at the exhaust outlet, the RS-4D increases airflow, resulting in smoother power delivery and increased throttle control. Preliminary testing has shown that it offers increased horsepower and torque throughout the power curve, especially in the bottom to mid RPM range.

  • Full system; header and muffler included
  • Ultra lightweight carbon fiber end-cap cover
  • Unique dual outlet design
  • Increased torque and horsepower throughout the power curve, with most gains in the bottom to mid RPM range
  • Smooth power delivery allowing easier throttle control and less clutching
  • Dual tip allows for more flow by increasing outlet open area when compared to single outlet designs
  • Dual inserts for horsepower tuning and decible reduction


by PowerReviews
Yoshimura - Pro Series RS-4D Exhaust System (Kawasaki)

(based on 1 review)

Ratings Distribution

  • 5 Stars



  • 4 Stars



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  • 2 Stars



  • 1 Stars



Reviewed by 1 customer

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Great Exhaust, Great power gain

By Kawi99

from Kuwait

Verified Buyer


  • Durable
  • Lightweight
  • Versatile


  • Difficulty fixing midpipe

Best Uses

  • Off-Road
  • Racing

Comments about Yoshimura - Pro Series RS-4D Exhaust System (Kawasaki):

Great exhaust, looks and sounds amazing, got great gains of the bottom end, yet still did not sacrifice gains mid-top...cant wait to see what more gains i will get when i install the moto tassinari air4force and yoshimura PIM-2

  • Motorsports:
  • Competitive Rider

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