Yoshimura · RS-9T · Slip-On
The Yoshimura RS-9T Stainless Slip-On Exhaust is a Street Series Exhaust System designed specifically for the Honda GROM 2022–2026. Built around Yoshimura’s RS-9T muffler, it’s made to deliver a sharp, modern look along with the tunable character riders want from a slip-on.
This system uses a stainless construction and includes the INS-RS9B-K sound insert. The RS-9T muffler is also designed to accept multiple sound insert options, letting the rider tailor sound reduction and power delivery to match the bike’s setup and riding environment (see the sound insert table on the page).
This RS-9T Street Series slip-on is built with a stainless construction and is engineered as a model-specific exhaust for the Honda GROM 2022–2026. It’s a straightforward way to change the bike’s exhaust character while keeping the fitment focused on the third-generation Grom platform.
Yoshimura states the RS-9T muffler allows the use of 5 sound insert options to customize power delivery and sound reduction.
Yoshimura notes the system shown is pre-production, and production systems will come with a matte carbon fiber end cap and heat shield. These production-spec components add a finished look and help define the RS-9T’s styling on the 2022–2026 GROM application.
Engineering
Yoshimura developed this RS-9T Street Series slip-on for the third generation Honda Grom and positions it as a styling- and clearance-minded exhaust solution for the updated platform. Designed as a slip-on system and constructed from stainless, it’s intended to integrate cleanly with the Honda GROM 2022–2026 fitment listed on the page.
Sound
This RS-9T system includes the INS-RS9B-K sound insert, and the muffler is designed to accept additional insert options for riders who want to fine-tune sound reduction and power delivery. Spark arrester capability is listed as not included, with SA-15-K shown as an available option in the sound insert and spark arrester table. Refer to the on-page table for included versus optional configurations.
Installation
Emissions compliance is listed as QUALIFIED MANUFACTURER DECLARED "REPLACEMENT PART" for this exhaust system. The product page also includes supporting media such as a dyno chart, a product video, and an installation PDF, making it easier to review the system’s presentation and installation information before fitting it to a Honda GROM 2022–2026.
| Part Number | 12122BR520 |
|---|---|
| Brand | Yoshimura |
| Product Line | Street Series Exhaust System |
| Series | RS-9T |
| System Type | Slip-On |
| Material | Stainless |
| Sound Insert (Included) | INS-RS9B-K |
| Spark Arrester | Not included |
| Shipping Weight | 8 lb |
| Barcode | 00840025912335 |
| Emissions Compliance | QUALIFIED MANUFACTURER DECLARED "REPLACEMENT PART" |
| Make | Model | Model Years |
|---|---|---|
| Honda | GROM | 2022–2026 |
Fitment as listed by Yoshimura for part number 12122BR520.
| Part Number | Type | Included With This System |
|---|---|---|
| INS-RS9B-K | Sound Insert | Yes |
| 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.
