BMW M5 F90 Pre-preg Carbon Fibre Rear Diffuser by FORM (2017-2023)

Redefine the rear presence of your BMW M5 F90 Pre-preg with the Pre-Preg Carbon Fibre Rear Diffuser from FORM. This precision-moulded diffuser replaces the OEM lower rear trim to enhance underbody air extraction, reduce rear lift, and deliver the kind of aggressive visual stance normally reserved for factory performance editions.

Key Features:

• Direct OEM fitment — retains factory mounting points, wiring connectors, and sensor cut-outs where applicable
• Autoclave-cured pre-preg carbon fibre construction for a consistent 2x2 twill weave and show-quality clear-coat finish
• Direct-fit replacement for the OEM lower rear bumper section
• UV-stable clear coat prevents yellowing, fogging, and weave degradation over time
• Aggressive vertical fins add visual width and motorsport presence
• Backed by FORM Industries — a trusted name in OEM-level aftermarket upgrades for modern performance cars

Materials: Every panel is pressed in pre-preg carbon fibre and autoclave-cured for a dense, consistent weave and a high-gloss factory finish. The UV-stable clear coat protects against sun fade, road grime, and the surface micro-cracking that can affect lower-grade carbon parts after a few seasons of use.

Fitment: This product is designed specifically for the BMW M5 F90 Pre-preg, model years 2017-2023. It integrates with the factory panel lines, mounting points, and (where applicable) electronic systems, meaning no cutting, drilling, or bodywork modification is required for a standard install. Please double-check your chassis code against the listed fitment before ordering — if you're unsure, our support team is happy to confirm compatibility for your exact vehicle.

Installation: Fitment is straightforward for an experienced installer using standard hand tools. We strongly recommend installation by a qualified bodyshop or detailer, particularly for exterior components that require panel alignment, adhesive bonding, or painted-surface preparation. Full fitment guidance is provided in the box, and our support team can help confirm the best approach for your specific car.

The FORM Industries Difference: Where many aftermarket brands compete on price, FORM competes on fit and finish. Every part in the catalogue is developed on real cars — not just in CAD — with panel-gap tolerances, material selection, and finishing processes benchmarked against the OEM part it replaces. It's why FORM has become one of the go-to names for BMW M, Audi RS, and Porsche GT owners looking for an upgrade that genuinely measures up.