Yoshimura Stainless Steel RS-12 Full Exhaust for the Honda CRF300L & CRF300L Rally

The Yoshimura RS-12 Race Series Full Exhaust System (123410S520) is engineered to unlock the performance potential of the Honda CRF300L and CRF300L Rally. Developed and manufactured in California, this complete stainless steel system replaces the restrictive factory exhaust to deliver dyno-proven power gains and a deeper, more refined exhaust note.

Constructed with a stainless steel header and muffler body, the RS-12 is finished with a premium matte carbon fiber end cap. Its asymmetrical, aggressively profiled muffler maximizes internal volume to manage sound output while simultaneously providing increased clearance for the rear tire and brake caliper. By shedding over three pounds of unsprung weight and utilizing a tapered inlet design to push the muffler's mass forward, this system significantly improves the motorcycle's power-to-weight ratio and centralizes mass for sharper handling on technical trails.

Features

• Performance Gains: Increases horsepower by up to 6.8% at 8,520 RPM and torque by 4.3% at 6,600 RPM over the stock configuration.

• Weight Reduction: The complete system weighs just 9.0 lbs, saving 3.3 lbs compared to the OEM 12.3 lb exhaust.

• Premium Construction: Features a stainless steel header, precision-machined joints, a stainless muffler body, and a durable matte carbon fiber end cap.

• PTF Insert Ring: Utilizes Yoshimura's patent-pending Precision Taper Fit (PTF) insert ring, which drastically simplifies the removal and installation of spark arrestors or sound inserts.

• Trail Ready: Includes a pre-installed USFS-approved spark arrestor, ensuring compliance for public land and OHV trail riding.

• Carbon Heat Shield: Ships with a custom matte carbon fiber heat shield to protect the rider's leg and riding gear from the header pipe.

What's in the Box

• 1x Yoshimura RS-12 Stainless Steel Header

• 1x Yoshimura RS-12 Stainless Steel Muffler

• 1x Matte Carbon Fiber End Cap (Pre-installed)

• 1x USFS Approved Spark Arrestor (Pre-installed)

• 1x Carbon Fiber Heat Shield

• Model-Specific Mounting Hardware & Exhaust Springs

• (Note: OEM Honda exhaust port crush gasket is not included. We highly recommend installing a brand new OEM gasket during assembly).

Part Number: 123410S520