Q4 Hex Exhaust Silencer 15-19 KTM Husqvarna 250 350 450 500 - FMF 045590

The FMF Q4 HEX S/A exhaust represents the forefront of performance-driven quiet technology for off-road motorcycles. Utilising advanced chambers, internal baffles, and exclusive multistage packing, this slip-on delivers impressive power gains throughout the entire rpm range—all while remaining compliant with stringent USFS and FIM sound requirements. Reduced weight, robust durability, and built-in spark arrestor make it a top choice for riders demanding serious performance with minimal noise.

Features

• Industry-leading quiet performance with substantial power gains
• Meets USFS and FIM World Enduro sound regulations
• Integrated spark arrestor enhances safety
• Significantly lighter than OEM exhausts
• Constructed for maximum off-road endurance
• Made in the USA
• Notice: Closed Course Use Only

Specifications

• Item ID: 045590
• Type: Slip-On
• Configuration: Single
• Construction: Aluminium
• Finish: Natural
• Midpipe: Stainless steel
• Endcap: Stainless steel
• Spark arrestor: Screen insert (included)
• Quiet insert: Included
• Weight: 5.1 lbs
• Carb warning: None

Vehicle Fitment

Husqvarna

• FC 250 (2016–2018)
• FC 350 (2016–2018)
• FC 450 (2016–2018)
• FE 250 (2017–2019)
• FE 350 (2017–2019)
• FE 450 (2017–2019)
• FE501 (2017–2019)
• FX 350 (2017–2018)
• FX 450 (2017–2018)

KTM

• 250 EXC-F (2017–2019)
• 250 SX-F (2016–2018)
• 250 SX-F Factory Edition (2015–2017)
• 250 XC-F (2016–2018)
• 350 EXC-F (2017–2019)
• 350 SX-F (2016–2018)
• 350 XC-F (2016–2018)
• 450 EXC-F (2018–2019)
• 450 EXC-F Six Days (2017–2019)
• 450 SX-F (2016–2018)
• 450 SX-F Factory Edition (2015–2017)
• 450 XC-F (2016–2018)
• 500 EXC-F (2017–2019)