BMW F90, M5 LCI Carbon Fibre CS Style Rear Diffuser

BMW F90 M5 LCI Carbon Fibre CS Style Rear Diffuser

Finish the rear of your facelift BMW F90 M5 with this CS Style Rear Diffuser — a single-piece carbon fibre unit that fills the lower bumper with a wide, shallow strake pattern in the style of BMW's own CS models.

Where our 3D Style set builds depth with separate corner pieces, the CS design does the opposite: one clean span across the full width, with a broad centre channel and a restrained fin pattern either side of it. It widens the car visually rather than dropping it, which suits the LCI's flatter rear treatment.

This is the diffuser for an M5 that already looks purposeful and only needs the last panel finishing. On a Competition in particular, it matches the gloss black trim BMW already fits without shouting over it.

Measuring 81 cm across and roughly 444 g, it is moulded to the exact contour of the LCI bumper and bolts to existing points — no cutting, no drilling.

Key Features

Genuine Carbon Fibre

Real carbon construction with a deep gloss clear coat, at roughly 444 g for the whole unit.

CS Style Single-Piece Design

One clean span across the full width, with a broad centre channel rather than separate corner pieces.

81 cm Full-Width Coverage

Spans the entire lower bumper between the exhaust exits.

Moulded to the LCI Bumper

Formed to the facelift contour so panel gaps stay tight and the fixings land on existing points.

Bolt-On Installation

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

The Restrained Rear

For a car that already looks the part. Our 3D Style set is the option for a build meant to be noticed.

Styling Benefits

• Clean, full-width rear treatment in the CS idiom
• Widens the car visually rather than simply lowering it
• Genuine carbon weave that matches other carbon parts
• No cutting or permanent modification
• Fully reversible at resale or end of lease

Vehicle Fitment

BMW F90 M5 LCI (2021–2023)
BMW F90 M5 LCI Competition (2021–2023)

Please Note

This diffuser is moulded for the LCI facelift rear bumper. If your car is a 2018–2020 build, send us your VIN and we will confirm the correct part before dispatch — we list a separate 3D Style diffuser that covers the earlier bumper.

Professional installation is recommended. The diffuser should be offered up and aligned across its full 81 cm 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.