The FMF Q4 Hex Muffler is a performance-focused replacement exhaust muffler designed for select KTM, Husqvarna, and GasGas 4-stroke motorcycles. Manufacturer part number 045646 and vendor part number 79-4206 identify this application-specific exhaust component. Its internal baffles, chambers, and advanced sound-absorbing materials help accelerate exhaust flow while controlling noise and minimizing power loss.
Designed for riders who need strong exhaust performance without excessive sound output, the FMF Q4 Hex Muffler operates well below the 96 dB limit on most compatible machines. It also includes a U.S. Forestry-approved spark arrestor with a maintenance-free stainless steel screen, making it suitable for off-road use in areas where spark-arresting exhaust systems are required. The muffler is built to provide dependable service while supporting efficient exhaust flow and practical sound control.
Fitment: This FMF muffler fits the 2020 and 2021 KTM 350 XCF-W and KTM 500 XCF-W, the 2020 and 2021 Husqvarna FE 450 and FE 501, and the 2021 and 2022 GasGas EC 350F. Verify the motorcycle model, year, exhaust configuration, and manufacturer part number before installation to ensure proper fitment. The FMF brand and 045646 manufacturer part number provide reliable reference points when matching this muffler to the correct application.
Features:
- Performance exhaust design with internal baffles, chambers, and sound-absorbing materials to promote exhaust flow with reduced noise and minimal power loss
- Sound output remains well below 96 dB on most compatible motorcycles to help meet strict off-road sound requirements
- U.S. Forestry-approved spark arrestor with a maintenance-free stainless steel screen
- Application-specific fitment for select KTM, Husqvarna, and GasGas 4-stroke motorcycles
- Brand: FMF
- Manufacturer Part Number: 045646
- Vendor Part Number: 79-4206
- Model: Q4 Hex Muffler
Fitment:
2020 Husqvarna FE 250
2020 Husqvarna FE 350
2020 Husqvarna FE 450
2020 Husqvarna FE 501
2020 KTM 350 XCF-W
2020 KTM 500 XCF-W
2021 Gas-Gas EC 250F
2021 Gas-Gas EC 350F
2021 Husqvarna FE 250
2021 Husqvarna FE 350
2021 Husqvarna FE 450
2021 Husqvarna FE 501
2021 KTM 350 XCF-W
2021 KTM 500 XCF-W
2022 Gas-Gas EC 350F
2022 Husqvarna FE 250
2022 Husqvarna FE 350
2022 Husqvarna FE 450
2022 Husqvarna FE 501
2022 KTM 350 XCF-W
2022 KTM 500 XCF-W
2023 Gas-Gas EC 350F
2023 Husqvarna FE 250
2023 Husqvarna FE 350
2023 Husqvarna FE 450
2023 Husqvarna FE 501
2023 KTM 350 XCF-W
2023 KTM 450 XCF-W
2023 KTM 500 XCF-W