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FMF Powercore 4 Hex Slip-On Muffler 045666 - Beta 350 / 390 / 430 / 480 RR 2020-2026

FMF Powercore 4 Hex Slip-On Muffler 045666 - Beta 350 / 390 / 430 / 480 RR 2020-2026

Regular price $449.99 USD
Regular price $449.99 USD Sale price $449.99 USD
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FMF Powercore 4 Hex Slip-On Muffler 045666 - Beta 350 / 390 / 430 / 480 RR 2020-2026

Please Note: Closed course competition use only.

Product Description

The FMF Powercore 4 Hex Slip-On Muffler features a Hi-Flo end cap engineered to boost all-around performance across your machine's power band. It is computer-designed and dyno-tested for individual 4-stroke applications to ensure maximum efficiency.

Enhanced sonic evacuation delivers a higher flow of exhaust gases to increase power, while a stainless steel mid-pipe mates to the computer-designed rear can for lightweight durability. Round perforated steel inner cores provide optimum flow using hi-flo technology, complemented by FMF's exclusive cross-weave internal packing for longevity and sound dispersion.

Top Features: FMF Powercore 4 Hex

  • Hi-Flo end cap boosts all-around performance.
  • Computer-designed and dyno-tested for every 4-stroke application[cite: 1].
  • Enhanced sonic evacuation delivers a higher flow of exhaust gases, which increases power[cite: 1].
  • Stainless steel mid-pipe mates to the computer-designed rear can for lightweight durability[cite: 1].
  • Round perforated steel inner cores make for optimum flow, using hi-flo technology[cite: 1].

Please review the detailed compatibility data below to ensure an exact fitment match for your motorcycle before finalizing your purchase.

Fitment List

Year Range Vehicle Brand Vehicle Model & Sub-Model
2026 Beta 390 RR Race Edition 4T
2025-2026 Beta 350 RR X-Pro
2025-2026 Beta 390 RR X-Pro
2025-2026 Beta 430 RR X-Pro
2025-2026 Beta 480 RR X-Pro
2024 Beta 350 RR S 4T
2024 Beta 390 RR S 4T
2024 Beta 430 RR S 4T
2021, 2025 Beta 350 RR 4T
2021, 2025 Beta 390 RR 4T
2021, 2025 Beta 430 RR 4T
2021, 2025 Beta 480 RR 4T
2020-2026 Beta 350 RR-Race Edition
2020-2026 Beta 390 RR-Race Edition
2020-2026 Beta 430 RR-Race Edition
2020-2026 Beta 480 RR-Race Edition
2020-2023 Beta 350 RR-S
2020-2023 Beta 390 RR-S
2020-2023 Beta 430 RR-S
2020, 2023-2024 Beta 350 RR
2020, 2023-2024 Beta 390 RR
2020, 2023-2024 Beta 430 RR
2020, 2023-2024 Beta 480 RR

Frequently Asked Questions

Q: What materials are used to construct the Powercore 4 Hex slip-on?
A: It features an elliptical aluminum can, a stainless steel mid-pipe, and a stainless steel end cap with round perforated steel inner cores[cite: 1].

Q: Is this exhaust intended for closed course competition?
A: Yes, it is designated for closed course competition use only[cite: 1].

Expert Pro-Tip

Expert Pro-Tip: Apply a light coat of high-temperature silicone at the slip-joint connection during installation to create a perfect seal against exhaust leaks. Ensure that all mounting hardware is tightened evenly to account for vibration on high-output 4-stroke engines.

Recommended Pairings:

About Moto-House MX

At Moto-House MX, we carry the best brands in motocross and off-road performance. Our team has over 40 years of experience helping riders get more out of their bikes. We pride ourselves on great customer service, and every item ships FAST - straight to your door.

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