Give your F8X M3 or M4 a bold, track-ready rear makeover with the PSM Style Carbon Fiber Rear Diffuser. Crafted from real 2x2 twill weave carbon fiber and finished in a UV-resistant gloss, this four-piece diffuser set features deep fins and an undertray for a menacing stance without sacrificing OEM integration.

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Key Features

• Four-piece design: diffuser, two side extensions, and undertray

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

• UV-resistant, high-gloss clear coat for long-term sheen

• Engineered for precision OEM fitment — no trimming required

• Lightweight yet rigid for secure application

• Matte or forged carbon finish options available upon request

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Compatible Models

• BMW F80 M3 (2015–2020)

• BMW F82 M4 Coupe (2015–2020)

• BMW F83 M4 Convertible (2015–2020)

Designed exclusively for factory F8X rear bumpers; not compatible with other 3 Series or 4 Series platforms. 

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What’s Included

• (4) Carbon Fiber Rear Diffuser Components—Main Rear Diffuser, 2 Side Extensions, Undertray

• 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 component 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.