Kawasaki KX450 2019-2021/KX450X 21 - Yoshimura SigSeries RS-12 Full System Stainless/Al/Carbon

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 maximze 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 calliper.
• 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 fibre 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