Yoshimura - RS-4 Full System (Suzuki)

Yoshimura - RS-4 Signature Series Full System (Suzuki)

Built straight from Yoshimura’s racing pedigree, the RS-4 Signature Series Full System gives Suzuki riders that factory-level performance, sound, and style. Designed to pull harder out of the gate and add torque throughout the rev range, the RS-4 helps your RM-Z450 launch strong, hook up clean, and pull longer down the straight. It’s a complete system engineered to win — lighter than stock, smoother through the midrange, and tuned for that deep Yoshimura growl that makes a four-stroke sound just right.

The RS-4’s pentagonal canister isn’t just for looks — it houses Yoshimura’s Polyresonant Duplex Chamber and stepped baffle design to control noise while boosting power. A stainless steel header and carbon fiber end cap give it a clean factory finish that can take real abuse. And if you want to cut even more weight, Yoshimura offers titanium versions that look as good as they perform.

Why We Like It:
You can feel the race DNA in this system. Throttle response snaps to life, the midrange torque feels meatier, and it still keeps sound levels smart and clean. The RS-4 gives your Suzuki that pro-level punch without making it harsh or high-maintenance — just smooth, reliable power that hits right when you need it.

Why It’ll Work for You:
This system transforms how your bike builds power — smoother off the bottom, stronger through the mid, and more drive when you twist it wide open. The Polyresonant Chamber controls sound without killing flow, while the stepped baffle helps your RM-Z pull harder through every gear. It’s a true race-bred setup that delivers consistent performance, lighter weight, and that unmistakable Yoshimura tone — refined, powerful, and ready for the gate.

Key Features:

• Pentagonal-shaped muffler sleeve for unique factory styling
  
  

• Front muffler cap functions as a Polyresonant Duplex Chamber to reduce noise
  
  

• Two-stage stepped baffle for improved torque and throttle response
  
  

• Carbon fiber end-cap with Yoshimura race design
  
  

• Available in three configurations:
  
  

• Stainless header / Aluminum can / Carbon End Cap
  
  

• Titanium header / Titanium can / Carbon End Cap
  
  

• Titanium header / Carbon can / Carbon End Cap
  
  

• Lightweight design saves pounds over stock
  
  

• Dyno- and race-tested for proven performance gains