Carbon Fiber GTX Rear Diffuser – BMW G80 M3 / G82 G83 M4
The GTX 5 Piece Carbon Fiber Rear Diffuser for the BMW G80 M3 and G82 / G83 M4 is designed for owners who want a more aggressive rear profile while maintaining the precision fitment expected from premium aftermarket aero components. With its multi-piece configuration and motorsport-inspired geometry, this diffuser transforms the rear of the G8X platform with a sharper, more purposeful presence.
Unlike traditional single-piece diffusers, the GTX 5-piece configuration creates deeper visual separation between the center and outer sections, giving the rear bumper a far more sculpted appearance. The result is a diffuser design that adds both visual depth and a race-inspired aesthetic that complements the aggressive body lines of the G80 M3 and G82 / G83 M4.
Each section is engineered to integrate seamlessly with the factory rear bumper profile, preserving OEM-level alignment while dramatically enhancing the rear aerodynamics of the vehicle.
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Key Features
• 5 piece carbon fiber diffuser
• Constructed from real carbon fiber with a 2×2 twill weave pattern
• Lightweight yet rigid—designed to preserve structural form under dynamic conditions
• Adds functional lighting and bold visual presence with OEM+ precision
• Matte and forged carbon options available upon request
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Compatible Models
• BMW G80 M3 Sedan (2021–Present) — both Base & Competition models
• BMW G82 M4 Coupe (2021–Present)
• BMW G83 M4 Convertible (2021–Present)
Fitment spans both Pre‑LCI and LCI bumper variants.
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What’s Included
• (1) Carbon Fiber 5 piece Rear Diffuser
• 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.
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Quick Answers
Will this fit my vehicle?
This part is made for the models listed above. If you’re unsure, send us your year, make, and model and we’ll confirm fitment for you.
What’s included?
You’ll receive exactly what’s shown. Hardware is not included unless the product description says otherwise.
How’s the install?
We recommend professional installation. If you’re local, you can book an install with us directly. Some parts may need trimming, drilling, or adjustment depending on your setup.
Do you ship internationally?
Yes, we ship worldwide. Contact us if you need help placing an international order.
Still have questions?
Reach out anytime. We’re here to help before and after your order.
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With over a decade of hands on experience, a growing portfolio of award winning show builds, and direct relationships with top-tier brands, we make sure you get premium products, trusted service, and real automotive expertise. Our team has built multiple award winning vehicles featured at top tier shows like SEMA and Bimmer Invasion. Everything we offer is tested, trusted, and backed by real world experience.
Eterna Motorworks can source or special-order nearly any component for your build — OEM-fitment parts, performance upgrades, carbon fiber aero, suspension, wheels, and even bespoke options depending on the platform. Click here to contact our team.