BMW G22, M440i Carbon Fibre 3D Style Rear Diffuser

BMW G22 / G23 M440i Carbon Fibre 3D Style Rear Diffuser

This is the full treatment for the rear of your BMW M440i — a multi-piece 3D Style diffuser in dry carbon fibre, with a deep-strake centre section and two separate corner splitters that carry the design out into the bumper corners.

Where a single-piece diffuser can only work in the middle of the bumper, a three-part set works right across it. The centre section drops the visual height under the exhaust exits, and the outer splitters pick that line up and push it outward, so the car gains width as well as stance.

On a 4 Series in particular that matters. It is a narrow-looking car from directly behind, and widening the rear is the single most effective thing you can do to it.

Every piece is moulded in dry carbon fibre with a gloss clear coat, formed to the exact contour of the G22 bumper so the fixings land on existing points and nothing needs cutting.

Key Features

Genuine Dry Carbon Fibre

Real dry carbon construction with a deep gloss clear coat.

Multi-Piece 3D Design

A deep-strake centre section plus two corner splitters, so the set adds width as well as depth.

Corner Splitters Included

The outer pieces carry the design into the bumper corners, which a one-piece diffuser cannot do.

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.

The Bolder of the Two

For a rear meant to be noticed. Our V.1 diffuser is the single-piece alternative.

Styling Benefits

• Widens the rear of a narrow-looking car
• Genuine depth from a multi-piece design, not a flat panel
• 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 required. The corner splitters must be aligned to the centre section before any fixing is tightened, or the joins will not sit flush.

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.