FMF PowerCore 4 HEX Muffler 044441 for Yamaha YZ450F, YZ450FX and WR450F

When designing the PowerCore 4 HEX, we looked at our top of the line products to deliver race-inspired performance at an economical price. The end result is a quality muffler with improved torque, increased horsepower and rugged durability all at a price that won't break the bank.

The FMF PowerCore 4 HEX Muffler is designed to deliver race-inspired performance with dependable durability at an accessible price. Featuring a high-flow internal core and enhanced sonic evacuation, this muffler is engineered to improve exhaust flow while supporting increased horsepower and torque across the engine’s usable power range.

Built with durable stainless steel and aluminum construction, the PowerCore 4 HEX is designed to withstand demanding off-road and motocross conditions. Its space-age internal packing material helps promote long service life, while the removable spark arrestor supports trail and off-road riding applications. The muffler can be used with either an FMF header or the stock OEM header for flexible installation options.

The FMF PowerCore 4 HEX Muffler, manufacturer part number 044441 and vendor part number 044441, fits select Yamaha four-stroke models, including the 2018–2022 Yamaha YZ450F, 2019 Yamaha YZ450FX, 2019 Yamaha WR450F, and 2020–2022 Yamaha YZ450FX. Designed as a model-specific exhaust component, it provides a performance-focused replacement for compatible factory mufflers while maintaining a rugged, practical design for competition and recreational use.

Features:

• Performance-focused muffler designed to improve power and torque
• Durable stainless steel and aluminum construction
• Space-age internal packing material for extended service life
• Hi-Flo internal core technology promotes improved exhaust flow
• Enhanced sonic evacuation supports increased airflow and power
• Removable spark arrestor included
• Compatible with an FMF header or the stock OEM header
• Fits 2018–2022 Yamaha YZ450F, 2019 Yamaha YZ450FX, 2019 Yamaha WR450F, and 2020–2022 Yamaha YZ450FX models
• Brand: FMF
• Manufacturer part number: 044441
• Vendor part number: 044441

Fitment:
2018 Yamaha YZ450F
2019 Yamaha WR450F
2019 Yamaha YZ450F
2019 Yamaha YZ450FX
2020 Yamaha WR450F
2020 Yamaha YZ450F
2020 Yamaha YZ450FX
2021 Yamaha WR450F
2021 Yamaha YZ450F
2021 Yamaha YZ450FX
2022 Yamaha WR450F
2022 Yamaha YZ450F
2022 Yamaha YZ450FX
2023 Yamaha WR450F
2023 Yamaha YZ450F
2023 Yamaha YZ450FX
2024 Yamaha WR450F
2024 Yamaha YZ450F
2024 Yamaha YZ450FX
2025 Yamaha WR450F
2025 Yamaha YZ450F
2025 Yamaha YZ450FX
2026 Yamaha WR450F
2026 Yamaha YZ450F
2026 Yamaha YZ450FX