FMF Factory 4.1 — RCT Stainless Full System — GasGas EC 250F (2021), GasGas EC350F (2021)

The Factory 4.1 RCT in stainless steel construction. Same Resonance Chamber Technology and power gains as the titanium system, with a stainless mid-pipe and muffler body for budget-friendly toughness. Shorter length, lighter than stock, and quieter than OEM with FMF's Rapid Tuning System.

• FMF Resonance Chamber Technology (RCT)
• 304 stainless steel construction — rugged and corrosion-resistant
• Shorter overall length for mass centralization
• Rapid Tuning System (RTS) — sound insert and spark arrestor swaps
• Quieter than stock with weight savings

Fitment: 4-stroke bike specific — fits the following models:

• GasGas EC 250F (2021)
• GasGas EC350F (2021)
• Husqvarna FE 250 (2020-2021)
• Husqvarna FE 350 (2020-2023)
• Husqvarna FE 350 ROCKSTAR EDITION (2021)
• Husqvarna FE 450 (2020-2023)
• Husqvarna FE501 (2020-2023)
• KTM 350 XCF-W (2020-2022)
• KTM 450 XCF-W (2020-2023)
• KTM 500 XCF-W (2020-2023)

This is a 4-stroke exhaust. It is engineered for the 4-stroke engine architecture above and physically will not fit a 2-stroke bike. Verify your engine type before purchase.