CHINO, CA – November 19, 2025 – (Motor Sports NewsWire) – Elevate your adventure-ready Honda CRF300L or Rally with Yoshimura RS-12 Race Series Exhaust System – the ultimate upgrade for riders who demand more power, less weight, and distinctive sound. Born from relentless engineering in Chino, California, and tested by CRF expert Ari Henning, this Race Series beast transforms your dual-sport machine into a precision-tuned powerhouse. Hit the trails, with confidence – the RS-12 delivers on every front.
We didn’t just build an exhaust; we crafted a revolution. Starting with the CRF300L/Rally’s capable 286cc single, our RS-12 unlocks hidden potential with a Yoshimura exhaust note that pleases the ear with weight reduction and dyno-proven results that everyone can enjoy.
- Full System Power Surge: Bolt on the complete RS-12 for up to 6.8% more horsepower at 8,520 RPM and 4.3% additional torque at 6,600 RPM – all while running a spark arrestor for compliant, trail-legal riding. Feel the surge in every throttle twist, from low-end grunt to high-rev sing!
- Slip-On Simplicity with Serious Punch: Not ready for a full swap? The RS-12 slip-on with spark arrestor still crushes it with up to 7.0% HP gains at 5,000 RPM and 7.5% torque boost at the same peak – perfect for quick installs and immediate gratification.
Power is pointless without practicality. The RS-12 sheds pounds to keep you agile:
- Full System: A featherweight 9 lbs (vs. stock 12.3 lbs) – that’s over 3 lbs saved for sharper handling and effortless flicks.
- Slip-On: Slims down to 7.3 lbs (vs. stock muffler at 10 lbs), blending big-bore attitude with everyday usability.
Advanced muffler design tames roar to a refined growl, ensuring you stay under the radar (and within regs) while turning heads. Plus, every RS-12 includes our custom matte carbon fiber heat shield – sleek protection that looks as good as it performs, included with every full system or slip-on.
The RS-12 is engineered, developed and built in Chino, Ca. with quality you can trust.
A custom matte carbon fiber heat shield not only looks insane it’s functional
Adding more volume with our RS-12 muffler provides a quieter muffler and creates more power!
Power gains with Refined RS-12 Race Series full system.
Power gains with Refined RS-12 Race Series slip-on.
2021-25 Honda CRF300L/Rally Race Series RS-12 pricing and Info
2021-25 Honda CRF300L/Rally Race Series FS SS/SS/CF
Part #123410S520
MSRP: $849.00
Hi-res images available here:
Weights:
Stock full system: 12.3 lbs.
RS-12 full system: 9.0 lbs.
Sound levels:
(Using J2825 standards with SA-20-K Spark Arrestor installed)
2000 rpm
Stock: 77.3dB
RS-12 full system: 85.4dB
5000 rpm
Stock: 83.7dB
RS-12 full system: 90.3dB
2021-25 Honda CRF300L/Rally Race Series SO SS/SS/CF
Part #123412S520
MSRP: $749.00
Hi-res images available here:
Weights:
Stock muffler: 10.0 lbs.
RS-12 slip-on: 7.3 lbs.
Sound levels:
(Using J2825 standards Using J2825 standards with SA-20-K Spark Arrestor installed)
2000 rpm
Stock: 77.3dB
RS-12 slip-on: 84.7dB
5000 rpm
Stock: 83.7dB
RS-12 slip-on: 89.1dB
About Yoshimura
Yoshimura is renowned for its Research and Development. But producing the finest exhaust systems in the world requires more than a big R&D department. Yoshimura is the leading manufacturer of exhaust systems because our commitment to R&D is matched by our dedication to uncompromising quality standards and our expertise in manufacturing pipes that meet those standards.
Source: Yoshimura Research and Development of America
####
Discover more from Motor Sports NewsWire
Subscribe to get the latest posts sent to your email.
