Yoshimura · RS-9T · Full System
The Yoshimura RS-9T Stainless Full Exhaust is a Race Series Exhaust System full system developed for the Honda GROM 2022–2026. Built around Yoshimura’s RS-9T design, it’s aimed at riders looking to sharpen the Grom’s performance while adding a more aggressive, track-ready style.
A key advantage of the RS-9T muffler is the ability to tailor the bike’s power delivery and sound reduction using multiple sound insert options. For model-specific details and notes, reference the fitment table below, along with the installation PDF shown on the page.
Engineering
This system is part of Yoshimura’s Race Series Exhaust System lineup and uses the RS-9T series design in a complete full-system configuration. It’s engineered as a purpose-built exhaust solution for the 2022–2026 Honda GROM platform.
Materials
The RS-9T full system is specified as Stainless. It’s designed as a complete exhaust system assembly for the GROM, with the specifications table listing key product identifiers including the barcode 00840025912328 and shipping weight of 8 lb.
Sound
The RS-9T muffler supports 5 sound insert options to customize power delivery and sound reduction.
Fitment
This Yoshimura full system is listed for Honda GROM 2022–2026 fitment. Yoshimura also provides a special fitment note: Not Compatible with 2025 SP Models Lower Cowling as it interferes with cowling and cowling bracket. Confirm the fitment table below before purchase, especially when the motorcycle has model-specific bodywork.
Sound
Riders can fine-tune the RS-9T’s character through optional components. The sound insert and spark arrester table on the page shows available options and whether they are included. Listed options include Sound Insert codes INS-RS9B-K and INS-RS9C-K, plus Spark Arrester code SA-15-K, each shown as not included.
Included
To support setup and installation, this product page includes a dyno chart, a product video, and an installation PDF. The specifications table also notes Spark Arrester: Not included and Emissions Compliance: QUALIFIED MANUFACTURER DECLARED "MODIFIED PART", which may be relevant for how the system is used and configured.
| Part Number | 12122AR520 |
|---|---|
| Brand | Yoshimura |
| Product Line | Race Series Exhaust System |
| Series | RS-9T |
| System Type | Full System |
| Material | Stainless |
| Spark Arrester | Not included |
| Shipping Weight | 8 lb |
| Barcode | 00840025912328 |
| Emissions Compliance | QUALIFIED MANUFACTURER DECLARED "MODIFIED PART" |
| Make | Model | Model Years |
|---|---|---|
| Honda | GROM | 2022–2026 |
Fitment as listed by Yoshimura for part number 12122AR520.
| Part Number | Type | Included With This System |
|---|---|---|
| INS-RS9B-K | Sound Insert | No |
| INS-RS9C-K | Sound Insert | No |
| SA-15-K | Spark Arrester | No |
Instructions / What's Included (PDF)
Provided by Yoshimura. Opens in a new tab.
