FMF Q4 Hex Exhaust Silencer 18-26 Yamaha 450 YZ WR F FX - FMF 044442

FMF’s Q4 HEX S/A 044442 exhaust sets the standard for truly high-performance, low-noise off-road riding. Leveraging advanced muffler technology with intricate internal chambers and proprietary multi-stage packing, the Q4 delivers strong, usable power gains across the rev range while remaining compliant with stringent USFS and FIM World Enduro sound standards. The included spark arrestor and exceptionally durable construction make this slip-on system ideal for serious trail and enduro riders seeking long-term performance and reliability.

Features

• Reduced noise levels for environmentally responsible riding
• Meets USFS/FIM sound regulations for off-road competition
• Noticeable power gains across all RPMs
• Integrated spark arrestor (screen insert included)
• Substantially lighter than OEM exhausts
• Durable design tailored for extended off-road use
• Quiet insert included
• Constructed and manufactured in the USA

Specifications

• Item ID: 044442
• Type: Slip-On
• Configuration: Single
• Construction: Aluminium
• Finish: Natural
• Midpipe Material: Stainless Steel
• Endcap Material: Stainless Steel
• Spark Arrestor: Screen insert (included)
• Quiet Insert: Included
• Weight: 5.7 lbs
• Closed course use only
• Carb Warning: None

Vehicle Fitment

Yamaha

• WR450F (2019–2024)
• YZ450F (2018–2026)
• YZ450FX (2019–2025)

Supplier SKU: 06-1784.SIL.Q4. Supplier availability is subject to change.

Why Buy From FDY Performance?

Shop with FDY Performance Ltd, a UK-based motorcycle parts and accessories retailer. We offer friendly product support and UK delivery options. Please check your bike make, model and year against the fitment information before ordering.