Complete the side profile of your G80 M3 or G82 M4 with Dry Carbon Fiber Rear Extensions — designed to continue the flow of aggressive side skirts while tying into your rear diffuser and quarter panel lines. These subtle yet striking add-ons enhance the car’s stance, extending the lower rear edge to add depth and balance to your aero kit. Built from real carbon fiber and finished in a deep gloss, they deliver OEM+ aesthetics with motorsport influence.

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Key Features

• Rear side skirt extension pair (left + right)

• Constructed from real dry carbon fiber with a 2x2 twill weave pattern

• Real dry carbon fiber construction with UV-resistant gloss clear coat

• Matches factory body line curvature and profile

• Designed to pair with OEM or aftermarket side skirts

• Matte and forged carbon options available upon request

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Compatible Models

• BMW G80 M3 (2021–2025, Sedan) – Base & Competition

• BMW G82 M4 (2021–2025, Coupe) – Base & Competition

• BMW G83 M4 (2021–2025, Convertible)

Engineered to fit G8X side skirt profiles with precision

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What’s Included

• (1) Pair of Carbon Fiber Rear Extensions (Left + Right)

• Mounting tape or hardware may vary by production batch

• Installation hardware not included on most products

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Why Buy From Eterna Motorworks

Eterna Motorworks is the standard in premium aftermarket automotive parts and services. With over a decade of hands-on experience, we’ve earned the trust of enthusiasts and professional builders worldwide by delivering unmatched quality, precision fitment, and long-term credibility. Every part and service we offer is curated to meet the highest expectations in styling, performance, and reliability — both on the road and in the shop.

If you’re searching for a trusted partner to set your build apart — welcome to the team.

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Professional installation is highly recommended.

Installation hardware not included on most products.

For full fitment, installation, and store policy details, please refer to our policies before purchasing.

Worldwide shipping available upon request.

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Your next mod starts here. Upgrade your build the right way with Eterna Motorworks.