Yoshimura Exhaust Stainless RS-12 Full System Carbon End Cap Race Series E5+ Dual Lambda Honda CRF300 Rally  2025-2026

Elevate your adventure-ready Honda CRF300L or Rally with the Yoshimura RS-12 Race Series Exhaust System, the ultimate upgrade for riders who demand more power, less weight, and a distinctive sound.

Yoshimura stepped up to the plate and developed the RS-4 slip-on and full system for the all-new Honda CRF300L and Rally edition, and the results were fantastic! Born from relentless engineering in Chino, California, and tested by CRF expert Ari Henning, this RS-12 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.

Yoshimura didn't just build an exhaust; they crafted a revolution. Starting with the CRF300L/Rally's capable 286cc single, the 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 a custom matte carbon fibre heat shield sleek protection that looks as good as it performs, included with every full system or slip-on.

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

Supplied with SA-20-K removable baffle/spark arrestor for noise reduction.

This exhaust is designed and intended for closed course competition use only, and is labelled as such; it is neither designed nor intended for use on public roads or land.

This system is fitted with dual lambda ports and is compatible with Euro5+ Dual Lambda equipped bikes.