RS-12 Full Exhaust Fit: KTM 250/350 SX-F and FC250
By Yoshimura R&D of America, Inc. | Published: 2026-10-31
Category: Comparisons
The RS-12 stainless full exhaust fits 2022.5–2026 KTM 250/350 SX-F and Husqvarna FC250/350. Here is what the fitment covers and where it stops.
Quick answer
If you ride a 2022.5–2026 KTM 250/350 SX-F or Husqvarna FC250/350, the Yoshimura RS-12 stainless full exhaust with aluminum muffler is the direct-fit choice. If your bike falls outside that window, or you only want a slip-on, this system is not the right purchase.
What the RS-12 full system actually covers
The RS-12 is a full exhaust, not a slip-on. That means it replaces the header and muffler together, so fitment depends on the exact model and generation, not just the displacement badge. The catalog listing covers the 2022.5 KTM SX-F Factory Edition, 2023–2026 KTM 250/350 SX-F, and the 2022.5 Husqvarna Rockstar Edition FC250 plus 2023–2026 FC250/350.
Because the Austrian 250 engine was a brand-new platform for the 2022.5 Factory Edition and Rockstar models, earlier SX-F and FC machines use different exhaust geometry. Do not assume a 2022 standard model takes the same system.
Where the fitment stops
The listing does not cover KTM 450 SX-F, Husqvarna FC450, or earlier-generation 250/350 frames. It also does not list a spark-arrestor insert or a sound-level specification, so if you need a closed-course or trail-legal configuration, confirm those details before ordering rather than assuming they are included.
The trade-off: full system versus slip-on
A full RS-12 system gives you a matched header and muffler designed around the new 250/350 platform, which is why Yoshimura lists it as a complete system rather than a bolt-on muffler. The trade-off is installation scope: you are removing and refitting the header, so gaskets, torque sequences, and re-checking after the first heat cycle matter more than they do with a slip-on.
If you want a simpler install or you are keeping the stock header, a slip-on is the lower-effort path. If you want the system Yoshimura engineered as a complete unit for this generation, the full RS-12 is the one to compare against.
Fitment trade-offs to weigh
- Model year check: Confirm your bike is a 2022.5 Factory Edition/Rockstar, or a 2023–2026 KTM 250/350 SX-F or Husqvarna FC250/350. If it is a 2022 standard model or earlier, this system is not listed for it. Check the VIN or model-year plate before ordering, not the classified ad description.
- Full system versus slip-on: The RS-12 is a full exhaust, so plan for header removal and refitting. If you want to keep the stock header, compare a slip-on instead.
- Sound and spark arrestor: The catalog does not list a sound level or spark-arrestor insert for this system. If your track or trail requires either, verify before purchase. Ask the seller or check the product page for insert availability if you ride regulated areas.
Product facts
- KTM 250/350SX-F / Husqvarna FC250/350 22-26 RS-12 Stainless Full Exhaust, w/ Aluminum Muffler: RS-12 stainless full exhaust with aluminum muffler for 2022.5–2026 KTM 250/350 SX-F and Husqvarna FC250/350. This is the specific generation the system was developed for, so it is the correct starting point if your bike is in that window.
KTM 250/350SX-F / Husqvarna FC250/350 22-26 RS-12 Stainless Full Exhaust, w/ Aluminum Muffler
Who this system is for
Best for
- Riders on a 2022.5–2026 KTM 250/350 SX-F or Husqvarna FC250/350 who want a matched full system
- Owners of the 2022.5 Factory Edition or Rockstar Edition who want an exhaust developed for that new engine platform
Not for
- 2022 standard or earlier KTM/Husqvarna 250/350 models, which are not listed for this system
- Riders who want a slip-on only or need a documented spark-arrestor and sound level
