The Yoshimura RS-12 is the next evolution in dirt bike exhaust engineering — over three years in development alongside factory-sponsored athletes and devoted engineers. The result is a system that looks unlike anything else on the market and backs it up with real performance gains, weight reduction, and race-proven durability.
Key Features
- Asymmetrical RS-12 Profile — Maximizes muffler volume to manage sound, add power, and provide extra clearance for tire and brake caliper
- Matte Carbon Fiber End Cap — Works-look finish with decal inlays and industry-leading detailing; inner cap mounted design improves durability and simplifies servicing
- Patent-Pending Precision Taper Fit (PTF) Insert Ring — Makes installing and removing sound inserts and spark arrestors fast and tool-friendly
- Tapered Muffler Body Inlet — Pushes the system forward for improved weight centralization without sacrificing performance
- Precision Machined Joints — Race-grade construction throughout
- Weight Savings — Full system weight 8.5 lbs vs. stock 8.7 lbs
- 24+ Months of Factory Racing Development — Tested at the highest level of competition
- Made in the U.S.A. — Designed, developed, and manufactured domestically by Yoshimura
Specifications
- SKU: 244720S320
- Construction: Stainless Steel header / Aluminum canister / Carbon Fiber end cap (SS/AL/CF)
- System Weight: 8.5 lbs (vs. stock 8.7 lbs)
- Shipping Weight: 14.75 lbs
- Insert Ring: Patent-pending Precision Taper Fit (PTF)
- Accessories: Repack kits, optional inserts, and spark arrestors available separately
- Origin: Made in the U.S.A.
- Vendor: Yoshimura
Fitment
- 2019–2023 Kawasaki KX450F
- 2021–2023 Kawasaki KX450X
Always verify fitment with your model year before purchase. Repack kits, sound inserts, and spark arrestors are sold separately.
Join the pack!
In addition to our online parts sales we offer great in house service and customization of your favorite bikes.