{"product_id":"bmw-4-series-gran-coupe-g26-pre-preg-carbon-fibre-rear-diffuser-set-by-form-2021","title":"BMW 4 Series Gran Coupe G26 Pre-Preg Carbon Fibre Rear Diffuser Set by FORM (2021+)","description":"\u003cp\u003eSharpen the rear profile of your BMW 4 Series Gran Coupe G26 with the Pre-Preg Carbon Fibre 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.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect OEM fitment\u003c\/strong\u003e — retains factory mounting points, wiring connectors, and sensor cut-outs where applicable\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutoclave-cured pre-preg carbon fibre\u003c\/strong\u003e construction for a consistent 2x2 twill weave and show-quality clear-coat finish\u003c\/li\u003e\n\u003cli\u003eAggressive vertical fins add visual width and motorsport presence\u003c\/li\u003e\n\u003cli\u003eImproves underbody air extraction for reduced rear lift and improved stability\u003c\/li\u003e\n\u003cli\u003eDirect-fit replacement for the OEM lower rear bumper section\u003c\/li\u003e\n\u003cli\u003eBacked by \u003cstrong\u003eFORM Industries\u003c\/strong\u003e — a trusted name in OEM-level aftermarket upgrades for modern performance cars\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eMaterials \u0026amp; Construction:\u003c\/strong\u003e This component is produced from genuine \u003cstrong\u003epre-preg carbon fibre\u003c\/strong\u003e — 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.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eFitment:\u003c\/strong\u003e This product is designed specifically for the \u003cstrong\u003eBMW 4 Series Gran Coupe G26\u003c\/strong\u003e, model years \u003cstrong\u003e2021+\u003c\/strong\u003e. 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.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eInstallation:\u003c\/strong\u003e 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.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy FORM Industries:\u003c\/strong\u003e FORM has built a reputation among serious owners of BMW, Audi, and other modern performance cars by obsessing over the details most aftermarket brands skip — panel gap tolerances, UV-stable finishes, genuine pre-preg composite processes rather than cheaper wet-layup shortcuts, and in-house fitment testing on real cars rather than CAD models alone. The result is a range of parts that install like factory equipment and hold up the way factory equipment should.\u003c\/p\u003e","brand":"FORM Industries","offers":[{"title":"Default Title","offer_id":55620903502164,"sku":"FO-BG26RDCF","price":1429.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1019\/0425\/3268\/files\/bmw-4-series-gran-coupe-g26-pre-preg-carbon-fibre-rear-diffuser-set-by-tre-2021-tre-806449_c2a4face-2901-45ad-9ae7-a24cf4bdb968.jpg?v=1778501720","url":"https:\/\/fifty9performance.co.uk\/products\/bmw-4-series-gran-coupe-g26-pre-preg-carbon-fibre-rear-diffuser-set-by-form-2021","provider":"Fifty9 Performance","version":"1.0","type":"link"}