Yoshimura RS-12 Full System (Stainless/Alu/Carbon Cap) Kawasaki KX450 19-23

Yoshimura RS-12 Full System (Stainless/Alu/Carbon Cap) Kawasaki KX450 19-23

Yoshimura RS-12 Full Exhaust System (Stainless/Alu/Carbon Cap) Kawasaki KX450 19-23 and Kawasaki KX450X 21-22

The current generation Kawasaki KX450 has won over a lot of riders with its balanced chassis and predictable power delivery. We felt there’s still more on the table for improvement, enter our new RS-12.

With countless hours of track and dyno testing, the KX450 responded well to our RS-12 with crisp and clean usable power that is up across the entire rpm spectrum. The result, max HP was up 9.6% and torque was up as well at 5.6%.

Yoshimura RS-12 will improve your experience on the green machine and decrease dB level from stock noise levels. Just what the doctor ordered.

Proudly designed, developed and made in the USA!

  • Rubber mounted RS-12 muffler dampens vibration to subframe
  • Aggressive intelligently designed, the RS-12 asymmetrical shaped muffler allows maximize capacity and incorporates a resonance chamber for managing sound and increasing usable power. RS-12's unique profile also provides more clearance for tire and brake caliper.
  • Improved performance gains with refined power delivery.
  • Just like the works systems our Factory Racers use, RS-12 systems utilize precision machined joints. Machined joints provide a superior and exacting fit for joints by better securing the seal between two surfaces with a perfect 360 degree contact surface which translates into improved system life, fit and performance.
  • New patent pending Precision Taper Fit (PTF) insert ring makes it easy to install and remove sound inserts and spark arresters.
  • Works-look matte carbon fiber end cap with industry leading design, innovation and detailing as expected from Yoshimura.
  • Carbon end cap covers the RS-12 inner cap, thus improving looks, while providing easier service as compared to other sandwich mounting designs most commonly found in the industry.
  • Repack Kits, optional Inserts and Spark Arresters are available for all models


Introducing Signature Series by Yoshimura - an offering of exhaust systems that a dealer can install with confidence. Our Signature Series lineup is the answer for today's dealer who is faced with a challenging marketplace. The applications for the Signature Series line cover the entire powersports spectrum, including many of our off-road applications. Everyone of our Championship Winning Motocross exhaust systems and nearly all of out ATV/Side-by-Side applications are all members of the Signature Series Family. All Signature Series components are tested, documented, and marked as required by federal and state regulations.


  • Kawasaki KX450F 2019
  • Kawasaki KX450F 2020
  • Kawasaki KX450F 2021
  • Kawasaki KX450F 2022
  • Kawasaki KX450F 2023
  • Kawasaki KX450X 2021
  • Kawasaki KX450X 2022

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    Yoshimura RS-12 Full System (Stainless/Alu/Carbon Cap) Kawasaki KX450 19-23