The 2024 Kawasaki KX450 has been well received in terms of its handling and overall ride-ability, but the power output has been a point of disinterest for many so far. Check out our review of the RS-12 Yoshimura system aboard the new green machine.

Performance gains are massive with our RS-12 Signature Series system, adding a whopping 23.8% max hp and an incredible 16.4% max torque.

The RS-12 muffler has loads of features including our PTF insert system that makes changing inserts a breeze and an optimized muffler shape with added volume and brake caliper clearance.

Yoshimura's RS-12 systems are designed, developed, and manufactured in Chino, California.

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

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