Yoshimura · RS-12 · Slip-On
The Yoshimura RS-12 Signature Series Exhaust System is a slip-on aluminum muffler built for late-model KTM SX-F and XC-F models and Husqvarna FC and FX models listed in the fitment table below. Designed to deliver a sharper, more competitive feel, this RS-12 slip-on is aimed at riders who want a performance-focused upgrade without moving to a full system.
This setup includes and comes with the SA-19-K spark arrestor installed, adding confidence for off-road use while helping keep sound levels more manageable. The PTF insert system is designed to make spark arrestor or low volume insert changes quick and straightforward when switching between trail riding and track days.
Performance
Built as a Signature Series RS-12 slip-on, this muffler is intended to be a focused upgrade for KTM SX-F and Husqvarna FC/FX applications shown in the fitment list. It targets riders looking for a performance-oriented exhaust change while keeping the simplicity and serviceability associated with a slip-on muffler design.
Included
The SA-19-K spark arrestor is included and installed. Yoshimura also notes that with the SA-19-K spark arrestor fitted, the bike will be noticeably quieter, which can be appreciated when riding deeper in the wilderness where reduced dB output matters.
Sound
Yoshimura’s PTF insert system is designed to make it easy to install or remove the spark arrestor or low volume insert. This helps support quick setup changes depending on where the bike is being ridden, whether that is trail use with the spark arrestor in place or riding at an MX track.
Engineering
This RS-12 is part of Yoshimura’s Signature Series Exhaust System line and is listed as an aluminum muffler in the specifications. Yoshimura states the RS-12 is designed, developed, and made in the USA, reflecting the brand’s focus on in-house engineering and production for this slip-on application.
Sound
Yoshimura positions the RS-12 slip-on as a performance muffler that also brings practical benefits for off-road riding. With the included SA-19-K spark arrestor installed, Yoshimura notes the bike will be noticeably quieter, supporting more considerate sound levels when riding in remote areas where reduced noise can make a difference.
Like other Yoshimura mufflers, the RS-12 is intended to be serviced periodically. Yoshimura specifically calls out repacking or rebuilding as part of normal long-term ownership, and notes that components are available to help keep the RS-12 in good condition over time.
| Part Number | 262542S320 |
|---|---|
| Brand | Yoshimura |
| Product Line | Signature Series Exhaust System |
| Series | RS-12 |
| System Type | Slip-On |
| Material | Aluminum |
| Shipping Weight | 13 lb |
| Barcode | 00840025913721 |
| Emissions Compliance | QUALIFIED MANUFACTURER DECLARED "REPLACEMENT PART" |
| Make | Model | Model Years |
|---|---|---|
| Husqvarna | FC250 | 2023–2027 |
| Husqvarna | FC350 | 2023–2027 |
| Husqvarna | FC450 | 2023–2027 |
| Husqvarna | FX350 | 2023–2025 |
| KTM | 250SX-F | 2023–2027 |
| KTM | 250XC-F | 2023–2026 |
| KTM | 350SX-F | 2023–2027 |
| KTM | 350XC-F | 2023–2026 |
| KTM | 450SX-F | 2023–2027 |
| KTM | 450XC-F | 2023 |
Fitment as listed by Yoshimura for part number 262542S320.
Instructions / What's Included (PDF)
Provided by Yoshimura. Opens in a new tab.
