BMW G80 G81 M3 & G82 G83 M4 Pre-Preg Carbon Fibre CSL Rear Diffuser by FORM (2021+)

Sharpen the rear profile of your BMW G80 G81 M3 & G82 G83 M4 with the Pre-Preg Carbon Fibre CSL 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
• Aggressive vertical fins add visual width and motorsport presence
• UV-stable clear coat prevents yellowing, fogging, and weave degradation over time
• Improves underbody air extraction for reduced rear lift and improved stability
• Direct-fit replacement for the OEM lower rear bumper section
• 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.

Vehicle Compatibility: Engineered for the BMW G80 G81 M3 & G82 G83 M4, model years 2021+. The part uses factory mounting hardware and (where relevant) existing wiring connectors, so a standard install requires no modification to your car's bodywork or wiring loom. Chassis codes matter — please confirm yours matches the listed fitment above before placing your order.

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.

About FORM Industries: FORM Industries is a premium manufacturer of aftermarket exterior and interior upgrades for BMW, Audi, Mercedes-Benz, Volkswagen, Porsche, Tesla, and other modern performance vehicles. Every FORM part is engineered in-house, tested against OEM fitment standards, and finished to a specification that matches — and often exceeds — the factory equivalent. From pre-preg carbon fibre through to OEM-grade gloss black, every component is built to deliver the look, feel, and longevity expected at this price point.