BMW G22, M440i Carbon Fibre V.1 Rear Diffuser

BMW G22 / G23 M440i Carbon Fibre V.1 Rear Diffuser

Give the back of your BMW M440i the width the front already has with this V.1 Rear Diffuser — a full-span carbon fibre unit that replaces the plain lower valance with a properly shaped multi-strake design.

The G22's rear is its weakest angle from the factory. The bumper is tall and the section below the exhaust exits is a wide, featureless panel that makes the car look higher than it sits. A diffuser fills exactly that space.

The V.1 profile runs a set of defined vertical strakes across the centre with stepped outer sections that follow the bumper corners, so the rear gains both depth and apparent width rather than just a darker panel.

Moulded in dry carbon fibre with a gloss clear coat, formed to the exact contour of the G22 bumper so the outer edges follow the original line and the fixings land on existing points.

Key Features

Genuine Dry Carbon Fibre

Real dry carbon construction with a deep gloss clear coat, lighter and stiffer than the moulded valance it replaces.

V.1 Style Design

Defined vertical strakes through the centre with stepped outer sections that follow the bumper corners.

Full-Width Coverage

Spans the entire lower rear between the exhaust exits.

Moulded to the Factory Bumper

Follows the original contour so panel gaps stay tight and the strakes align with the exhaust exits.

Bolt-On Installation

Mounts to the existing points. No cutting or drilling of the bumper.

Fits Coupe and Convertible

The G22 coupe and G23 convertible share the rear bumper, and it suits the 430i as well as the M440i.

Styling Benefits

• Fills the plain panel under the rear bumper
• Adds apparent width as well as depth
• Genuine dry carbon weave that matches other carbon parts
• No cutting or permanent modification
• Fully reversible at resale or end of lease

Vehicle Fitment

BMW G22 M440i Coupe (2020+)
BMW G22 430i Coupe (2020+)
BMW G23 M440i Convertible (2020+)
BMW G23 430i Convertible (2020+)

Please Note

Please select your exact model above so we can confirm the correct part before dispatch. This diffuser is shaped for the M Sport rear bumper.

Professional installation is recommended. The diffuser should be offered up and aligned across its full width before any fixing is tightened.

Carbon fibre is a natural woven material. Minor variation in weave pattern between pieces is characteristic of the material and not a defect.

Made to order. Please contact us to confirm current lead time before ordering.

Why Choose Proven Performance Parts

We specialise in high-performance parts for European vehicles — including Volkswagen GTI & R models, Audi S/RS platforms, and BMW M vehicles. Every product we offer is carefully selected for its quality, fitment, and real-world performance — tested by enthusiasts, for enthusiasts.