Yoshimura · RS-12 · Full System
The Yoshimura RS-12evo Signature Series Exhaust System is a full system engineered for the Honda CRF450R 2027 and Honda CRF450RX 2027. This SS/TI configuration combines stainless and titanium pipe materials with a titanium muffler to deliver a refined setup built around the latest CRF450R/RX platform updates.
Yoshimura positions the RS-12evo as the latest evolution of its RS-12 line, developed to improve rideability, power and torque while also reducing weight. Design details like a hydroformed header primary, cast manifold, and an updated muffler/resonator layout are focused on fit, durability, and a clean integration with the motorcycle’s surrounding components; see the fitment table below for supported models.
Engineering
RS-12evo uses an all-new hydroformed titanium muffler designed for efficient use of the area next to the airbox, subframe and shock. Yoshimura states the fitment is engineered to nest with the stock side panel, creating a custom tailored layout around the bike’s packaging.
Technology
An all-new two-piece resonator is integrated into the RS-12evo muffler. Yoshimura explains that it fine tunes the power, reduces sound, and further improves durability, adding another layer of refinement to the system’s overall design.
Fitment
The hydroformed header primary is designed to match the oval exhaust port and provide a smooth internal transition from oval to round. Yoshimura notes increased durability by reducing welded connections, along with improved fit through the repeatability of the hydroforming process.
Materials
This RS-12evo Signature Series Exhaust System is a full system that pairs stainless and titanium pipe materials with a titanium muffler. Yoshimura describes the RS-12evo as an all-new system for the updated CRF450R platform, with development aimed at improving rideability along with power and torque, while also reducing weight.
Engineering
Yoshimura’s updated RS-12evo muffler design centers on tight, purposeful packaging around the motorcycle. The hydroformed titanium muffler is shaped to make efficient use of the area next to the airbox, subframe and shock, and Yoshimura states it is engineered to nest with the stock side panel. A two-piece muffler resonator is also incorporated to fine tune the power, reduce sound, and improve durability.
Fitment
Up front, RS-12evo features a hydroformed header primary intended to match the oval exhaust port and create a smooth internal transition from oval to round. Yoshimura attributes improved durability to fewer welded connections and emphasizes the repeatable fit made possible by the hydroforming process. The system also includes a cast manifold, which Yoshimura lists as providing increased strength and durability along with easier installation and removal.
Development
Yoshimura states the CRF450R RS-12evo is designed, developed and made in the USA with the help of Team Honda HRC race teams in the USA, Europe and Japan. The system also incorporates a header resonator developed in cooperation with Honda HRC teams; Yoshimura notes this component is used to maximize power across the spectrum while enhancing rider connectivity.
| Part Number | 225870S720 |
|---|---|
| Brand | Yoshimura |
| Product Line | Signature Series Exhaust System |
| Series | RS-12 |
| System Type | Full System |
| Pipe Material | Stainless, Titanium |
| Muffler | Titanium Muffler |
| Shipping Weight | 1 lb |
| Barcode | 00840025920088 |
| Emissions Compliance | QUALIFIED MANUFACTURER DECLARED "REPLACEMENT PART" |
| Make | Model | Model Years |
|---|---|---|
| Honda | CRF450R | 2027 |
| Honda | CRF450RX | 2027 |
Fitment as listed by Yoshimura for part number 225870S720.
Instructions / What's Included (PDF)
Provided by Yoshimura. Opens in a new tab.
