What kind of power increase can I expect with this muffler?

This muffler is designed to increase horsepower and torque throughout the entire power band. The gains are intended to be useable for all riding styles, making your bike feel more responsive.

What materials is this muffler made from?

The main body of the muffler is constructed from aluminum, while the Hi-Flo end caps and other internal components are made from durable stainless steel.

Does this muffler come with a spark arrestor?

Yes, a removable spark arrestor is included with the muffler. This is useful for trail riding in areas where spark arrestors are required.

FMF Racing Powercore 4 Hex Muffler 045666

Name: FMF Racing Beta 350/390/430/480RR 20-24 Powercore 4 Hex Muffler
Brand: FMF Racing
SKU: fmf-racing-fmf-racing-beta-350-390-430-480rr-20-24-powercore-4-hex-muffler-t14-686899
Price: 440.31 USD
Availability: BackOrder

FMF Racing Beta 350/390/430/480RR 20-24 Powercore 4 Hex Muffler

$440.31

On Backorder — Expected to ship by Jun 2, 2026

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

FMF Racing Beta 350/390/430/480RR 20-24 Powercore 4 Hex Muffler. Aluminum construction with stainless steel components for improved performance.

Key Features

Fits Beta 350/390/430/480RR 2020-2024.
Developed to increase horsepower and torque throughout the entire power curve.
Aluminum performance muffler construction.
Durable stainless steel Hi-Flo end caps and components.
Completely redesigned for late model applications.
Removable spark arrestor included.

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Product Details

FMF Racing is well-known for making performance exhaust systems for off-road motorcycles. This Powercore 4 Hex Muffler is built specifically to give your Beta 350, 390, 430, or 480RR from 2020 to 2024 a noticeable boost in horsepower and torque across the entire power band. The improvements are designed to be useable for all riding styles, whether you're on the trail or the track.

This muffler uses a combination of aluminum for the main body and durable stainless steel for the Hi-Flo end caps. This blend creates a strong yet lightweight performance package that's built to last. It's a completely redesigned slip-on muffler, meaning it's made to fit right onto your existing exhaust system without major modifications. You'll find the power gains are spread throughout the RPM range, making your bike feel more responsive and powerful when you need it most.

A removable spark arrestor is included, which is important for trail riding in areas with fire restrictions. This muffler is a solid option if you're looking to get more usable power out of your Beta RR model.