Subtly elevate your G8X’s rear with these OEM‑Style Carbon Fiber Rear Extensions. Crafted from genuine carbon fiber with a UV-resistant gloss finish, these refinements clip directly into the lower bumper corners, enhancing the factory diffuser without altering the existing structure.

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Key Features

• OEM‑styled corner extensions for a refined aesthetic touch

• Constructed from real dry carbon fiber with 2×2 twill weave and UV-clear coating

• Lightweight yet sturdy to maintain design over time

• Direct clip‑in installation—flush fit with existing diffuser, no hardware or trimming required

• Ideal for pairing with OEM or M Performance-style diffusers for a complete look 

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Compatible Models

• BMW G80 M3 Sedan (2021–Present) — Base & Competition

• BMW G82 M4 Coupe (2021–Present)

• BMW G83 M4 Convertible (2021–Present)

Designed specifically for G8X chassis geometry—will not fit non‑M 3 Series or prior generations.

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What’s Included

• Pair of OEM-Style Carbon Fiber Rear Extensions (Left + Right)

• 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 craftsmanship, we’ve earned the trust of enthusiasts and professional builders worldwide through unmatched quality, precision fitment, and enduring credibility. Every component is curated to meet the highest expectations in styling, performance, and reliability—whether on the road or the track.

If precision, quality, and subtle styling matter to your build—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 the build the right way with Eterna Motorworks.