Q4 Hex Exhaust Silencer 18-23 KTM Husqvarna GasGas 250 350 450 SX-F XC-F FC FX MC EX - FMF 045627

The FMF Q4 HEX S/A 045627 is engineered for discerning off-road riders demanding peak performance alongside minimal noise. Leveraging advanced chambered baffling and exclusive packing materials, this slip-on silencer delivers substantial power gains across the rpm range while meeting USFS and FIM World Enduro sound standards. Designed for durability and weight savings, it includes a spark arrestor as standard, making it ideal for rugged, long-distance trail use. Manufactured in the USA, this exhaust is the definitive solution for those seeking quiet, race-quality exhaust systems without compromise.

Features

• USFS and FIM World Enduro compliant sound levels


• Proprietary multistage packing material ensures quiet operation


• Boosts power throughout the full rpm range


• Integrated spark arrestor for off-road legality


• Lighter than OEM systems—improves manoeuvrability


• Robust aluminium and stainless steel construction


• Slip-on, single-exit configuration


• Quiet insert included


• Designed and manufactured in the USA


• Closed course use only

Specifications

• Item ID: 045627


• Type: Slip-On


• Configuration: Single


• Construction Material: Aluminium


• Finish: Natural


• Midpipe Material: Stainless Steel


• Endcap Material: Stainless Steel


• Spark Arrestor: Screen insert (included)


• Quiet Insert: Included


• Weight: 6.1 lbs (2.77 kg)


• Carb Warning: No

Vehicle Fitment

GAS GAS

• EX 250F (2021–2023)


• EX 350F (2021–2023)


• EX 450F (2021–2023)


• MC 250F (2021–2023)


• MC 350F (2021–2023)


• MC 450F (2021–2023)

HUSQVARNA

• FC 250 (2019–2022)


• FC 350 (2019–2022)


• FC 450 (2019–2022)


• FC 450 Rockstar Edition (2018, 2020–2021)


• FX 350 (2019–2022)


• FX 450 (2019–2022)

KTM

• 250 SX-F (2019–2022)


• 250 XC-F (2019–2022)


• 350 SX-F (2019–2022)


• 350 XC-F (2019–2022)


• 350 XC-F Kailub Russell (2021)


• 450 SX-F (2019–2022)


• 450 SX-F Factory Edition (2018, 2020–2021)


• 450 XC-F (2019–2022)