Yoshimura 262540S320 2022-2026 KTM/Husqvarna 250/350 RS-12 Full Exhaust — Tuned Header Resonator

Yoshimura — Dual-Resonator Power Optimization, Precision Performance for the New Austrian Platform

The updated 250 and 350cc engines found in the 2023+ KTM and Husqvarna models are engineering marvels, but the stock exhaust often creates a narrow power window that requires constant shifting to stay in the meat of the torque. The Yoshimura RS-12 Full System is the first production exhaust to utilize a tuned resonator on both the header and inside the muffler. This dual-resonance technology unlocks the bottom-end snap missing from the stock pipe while significantly broadening the power curve, allowing you to carry third gear through corners where you used to downshift.

Developed alongside elite factory teams, the RS-12 provides a 2.7% increase in max horsepower and a 2.6% boost in peak torque. The construction features "Factory Quality" precision-machined joints that provide an airtight 360-degree seal, preventing the power-robbing turbulence common in inferior exhaust systems. With a tapered inlet that pushes the muffler forward for better weight centralization, your KTM 250 SX-F or Husqvarna FC 350 will feel lighter in the air and more planted in the ruts.

• Dual-Resonator Technology: Specific header and muffler resonators for enhanced bottom-end grunt and over-rev.
• Broadened Power Curve: Engineered to make the KTM 250/350 engine carry power longer through the RPM range.
• Factory Quality Machined Joints: Superior fitment that eliminates leaks and extends the life of the system.
• Asymmetrical RS-12 Profile: Maximizes internal volume while providing extra clearance for the rear brake caliper.
• Matte Carbon Fiber End Cap: Durable, inner-cap mounted design for a factory-level look and easy maintenance.
• SKU: 262540S320

Moto-House MX Pro Tip:

The 2023-2026 Austrian chassis is very sensitive to torque settings. When installing your new RS-12 header, ensure you tighten the flange nuts evenly and to the manufacturer's torque spec. An unevenly tightened header can lead to vibration through the footpegs and premature wear on the exhaust gasket. Always re-check the mounting bolts after your first 20-minute moto.

Year	Make	Model
2022.5 - 2026	KTM	250 SX-F / 350 SX-F (Including Factory Edition)
2023 - 2026	KTM	250 XC-F / 350 XC-F
2022.5 - 2026	Husqvarna	FC 250 / FC 350 (Including Rockstar Edition)
2023 - 2025	Husqvarna	FX 350

FAQ Questions

Q) What makes the "Resonator" header different?
A) The header resonator is a tuned chamber that manages exhaust pressure waves. On the KTM 250 SX-F, this translates to a much stronger "snap" off the bottom and a smoother transition into the mid-range.

Q) Does this system include a spark arrester?
A) No, this is a closed-course competition system. However, it is compatible with the Yoshimura SA-19-K spark arrester (sold separately) via the PTF insert ring.

Q) Will this fit the 2022.5 Factory Edition models?
A) Yes, this system was specifically designed to fit the 2022.5 Factory Edition KTM and Rockstar Edition Husqvarna models, as well as the 2023-2026 standard models.

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