Yoshimura · RS-12 · Slip-On
The Yoshimura RS-12 Stainless Slip-On Exhaust is an Enduro Series Exhaust System built for the Suzuki DR-Z4S-SM 2025–2026. Developed for riders who want an RS-12 slip-on option rather than a Race Series full system, it’s designed to deliver performance on the DR-Z4S while maintaining 50 state legality.
This stainless slip-on includes an installed USFS approved spark arrestor, SA-19-K, and a custom stainless Yoshimura heat shield. Yoshimura lists the stock slip-on at 13.6 lbs. and the Yoshimura RS-12 slip-on at 9.2 lbs., along with published sound figures for stock versus RS-12 with the spark arrestor installed.
Built as an RS-12 series slip-on in stainless, this Enduro Series Exhaust System is tailored specifically for the Suzuki DR-Z4S-SM 2025–2026. It’s positioned by Yoshimura as an alternative for riders who don’t want a Race Series full system, while still targeting performance on the DR-Z4S.
An installed USFS approved spark arrestor, SA-19-K, comes with this RS-12 slip-on. Yoshimura highlights this included component as a convenience for heading straight to off-road riding areas without needing to source a separate spark arrestor before the first ride.
The system includes a custom stainless Yoshimura heat shield. It’s a model-specific included piece that complements the RS-12 slip-on package, rounding out the setup with an added component designed for this DR-Z4S/SM application.
Fitment
Yoshimura developed this RS-12 Enduro Series slip-on specifically around the all-new Suzuki DR-Z4S/SM platform and lists fitment for Suzuki DR-Z4S-SM 2025–2026. It’s aimed at riders who want an RS-12 slip-on solution rather than stepping up to a Race Series full system. For exact application details, refer to the fitment table shown on the page.
Sound
Yoshimura provides published comparisons for weight and sound output. Listed weights are 13.6 lbs. for the stock slip-on and 9.2 lbs. for the Yoshimura RS-12 slip-on. Sound levels are stated with the installed spark arrestor and referenced as measured using J2825 standards, with stock and RS-12 values shown in the product details on the page.
Development
Yoshimura states the RS-12 is designed, developed, and manufactured in Chino, California. That development background is tied directly to the RS-12 series positioning within Yoshimura’s Enduro Series Exhaust System lineup and the specific DR-Z4S/SM slip-on configuration featured here.
Installation
This RS-12 slip-on is specified with spark arrestor SA-19-K included, and the page also lists additional sound insert and spark arrestor options by code in the dedicated table. For guidance during setup, the page includes an installation PDF, and a product video is also provided for a closer look at the system.
| Part Number | 116612S521 |
|---|---|
| Brand | Yoshimura |
| Product Line | Enduro Series Exhaust System |
| Series | RS-12 |
| System Type | Slip-On |
| Material | Stainless |
| Spark Arrester | SA-19-K (included) |
| Shipping Weight | 14 lb |
| Barcode | 00840025919914 |
| Emissions Compliance | QUALIFIED MANUFACTURER DECLARED "REPLACEMENT PART" |
| Make | Model | Model Years |
|---|---|---|
| Suzuki | DR-Z4S-SM | 2025–2026 |
Fitment as listed by Yoshimura for part number 116612S521.
| Part Number | Type | Included With This System |
|---|---|---|
| INS-32-K | Sound Insert | No |
| SA-19-K | Spark Arrester | Yes |
| SA-20-K | Spark Arrester | No |
| INS-34-K | Sound Insert | No |
Instructions / What's Included (PDF)
Provided by Yoshimura. Opens in a new tab.
