3DDesign Carbon Fibre Rear Diffuser for BMW M3 G80 G81 & M4 G82 G83 (2020+)

Transform the rear of your BMW with a Japanese-engineered carbon aero upgrade

Elevate the look and airflow of your G8X with this premium 3D Design carbon rear underbody valance. Developed in Japan and manufactured using an advanced CFRP infusion process, this one-piece carbon assembly delivers a clean motorsport aesthetic and genuine aerodynamic refinement for the factory lower bumper on the latest M3 and M4.

Built as a single, full-length carbon structure for strength and stability, it integrates seamlessly with the OE rear bumper, sharpening the stance while helping manage airflow beneath the car. The result is a purposeful, track-inspired finish that looks at home on both daily drivers and weekend builds.

Why this carbon upgrade stands out

• Japanese-developed CFRP infusion construction for a high-quality carbon composite
• One-piece design for precise alignment and a tight OEM-plus fit
• Real-world aero benefits that help smooth turbulence at the rear of the car
• Aggressive, performance-led styling that complements the factory exhaust surround

What you receive

• 1 x 3D Design full CFRP rear diffuser unit
• 2 x 3D Design CFRP rear insert pieces - optional add-on

Vehicle compatibility

• BMW M3 Saloon G80 - 2020 onwards
• BMW M3 Touring G81 - 2022 onwards
• BMW M4 Coupé G82 - 2020 to 2023 Pre-LCI
• BMW M4 Coupé G82 - 2024 onwards LCI
• BMW M4 Convertible G83 - 2020 to 2023 Pre-LCI
• BMW M4 Convertible G83 - 2024 onwards LCI

Installation and support

Professional fitting recommended. We install these in-house and the fit and finish have consistently impressed, with customers commenting on the instant visual upgrade and quality feel. For installation at MJ Modifications in Warwickshire, request a fitting quote at info@mjmodifications.co.uk.

Search-friendly terms

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