BMW 4 Series G22 G23 Form Industries Pre-Preg Carbon Fiber Competition Rear Diffuser Set (2020+)

Finish the rear of your BMW 420i, 430i, 440i and M440i (G22, G23) with the Form Industries Pre-Preg Carbon Fiber Competition Rear Diffuser Set, adding aggressive vertical fins and a motorsport-derived lower section that ties the whole rear together.

Key Features

• Material & Finish: Made from lightweight pre-preg carbon fiber, adding motorsport-grade material without the weight of the OEM part.
• Design: Sculpted fin design adds aggression and visual downforce to the rear.
• Precision Fitment: Modelled on OEM geometry for a clean, direct fit with no cutting or trimming required.
• Easy Installation: Fits using factory mounting points and included hardware — a straightforward upgrade.

Fitment

Engineered specifically for the BMW 420i, 430i, 440i and M440i (G22, G23). Confirm your exact model and chassis code before ordering.

Why Form Industries

Form Industries builds exterior and interior upgrades that fit right the first time — quality materials, precise tolerances, and U.S.-based dispatch and support.

Shipping

Form Industries products ship directly from our U.S. facility in Knoxville, Tennessee for fast, reliable nationwide delivery.