BMW 4 Series G22 G23 Pre-Preg Carbon Fibre Competition Rear Diffuser Set by FORM (2020+)

Sharpen the rear profile of your BMW 4 Series G22 G23 with the Pre-Preg Carbon Fibre Competition Rear Diffuser from FORM. Combining aerodynamic function with aggressive styling, this diffuser bolts directly in place of the factory unit for a clean OEM+ finish.

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
• UV-stable clear coat prevents yellowing, fogging, and weave degradation over time
• Direct-fit replacement for the OEM lower rear bumper section
• 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 & Construction: This component is produced from genuine pre-preg carbon fibre — the same autoclave-cured composite process used in Formula 1 and OEM performance parts. Unlike wet-layup or hand-laid alternatives, pre-preg delivers a tighter, more consistent weave, superior strength-to-weight ratio, and a show-finish gloss clear coat with full UV protection. The result is a part that looks as good in five years as it does on day one.

Fitment Notes: Built to suit the BMW 4 Series G22 G23, model years 2020+. This is a direct-fit replacement or overlay depending on variant — the part matches the factory mounting pattern and panel geometry of the listed models, so a standard install is bolt-on / clip-on with no cutting or drilling required. If your car was built with a non-standard options pack, it's worth checking fitment with our team before ordering.

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.