FMF PowerCore 4 HEX Muffler 045666 for Beta RR 350, 390, 430, and 480

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 practical durability for off-road riders. Built for improved torque, increased horsepower, and enhanced exhaust flow, this muffler helps optimize engine performance across a range of riding conditions. Its Hi-Flo internal core technology and enhanced sonic evacuation promote efficient exhaust flow while producing a responsive power delivery.

Constructed from durable stainless steel and aluminum, the FMF PowerCore 4 HEX is engineered to withstand demanding trail and competition use. Space Age internal packing material helps extend packing life and maintain consistent performance over time. A removable spark arrestor is included for off-road applications where spark arrestor compliance is required.

Fitment: The FMF PowerCore 4 HEX Muffler fits 2020–2022 Beta 350 RR, 390 RR, and 430 RR models, along with the 2022 Beta 480 RR. It can be installed with an FMF header or the stock OEM header, providing flexible compatibility for replacement or performance-focused exhaust upgrades. Manufacturer and vendor part number: FMF 045666.

Features:

• Performance: Designed to improve overall engine power and torque.
• Construction: Durable stainless steel and aluminum materials support long-term use.
• Packing: Space Age internal packing material promotes maximum longevity.
• Core Technology: Hi-Flo internal core design supports efficient exhaust flow.
• Exhaust Flow: Enhanced sonic evacuation helps increase flow and power.
• Spark Arrestor: Includes a removable spark arrestor for off-road use.
• Header Compatibility: Can be used with an FMF header or the stock OEM header.
• Fitment: Fits 2020–2022 Beta 350 RR, 390 RR, and 430 RR models, plus the 2022 Beta 480 RR.
• Part Number: FMF manufacturer and vendor part number 045666.

Fitment:
2020 Beta 350 RR
2020 Beta 390 RR
2020 Beta 430 RR
2020 Beta 480 RR
2021 Beta 350 RR
2021 Beta 390 RR
2021 Beta 430 RR
2021 Beta 480 RR
2022 Beta 350 RR
2022 Beta 390 RR
2022 Beta 430 RR
2022 Beta 480 RR
2023 Beta 350 RR
2023 Beta 390 RR
2023 Beta 430 RR
2023 Beta 480 RR
2024 Beta 350 RR
2024 Beta 390 RR
2024 Beta 430 RR
2024 Beta 480 RR
2025 Beta 350 RR
2025 Beta 390 RR
2025 Beta 430 RR
2025 Beta 480 RR
2026 Beta 350 RR
2026 Beta 390 RR
2026 Beta 430 RR
2026 Beta 480 RR