Carbon Fibre Rear Diffuser for BMW M140i/M135i LCI by FORM (2015-2019, F20 F21)
Delivery & Availability
Delivery & Availability
Not all products are held in stock due to the specialist nature of many performance parts. While most items are available for next working day dispatch, selected products may carry extended supplier or production lead times.
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Description
Redefine the rear presence of your BMW M140i/M135i LCI with the 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
- Aggressive vertical fins add visual width and motorsport presence
- Lightweight carbon fibre construction with a UV-protected gloss clear coat
- Direct-fit replacement for the OEM lower rear bumper section
- Improves underbody air extraction for reduced rear lift and improved stability
- Backed by FORM Industries — a trusted name in OEM-level aftermarket upgrades for modern performance cars
Materials & Construction: Manufactured from high-grade carbon fibre with a UV-stable clear coat, this component combines lightweight construction with the distinctive weave finish that defines performance-car styling.
Fitment Notes: Built to suit the BMW M140i/M135i LCI, model years 2015-2019, F20 F21. 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.
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