Audi B9.5, RS5 Carbon Fibre BC Style Rear Diffuser

Audi B9.5, RS5 Carbon Fibre BC Style Rear Diffuser

Sharpen the rear of your RS5 with the BC Style Carbon Fibre Rear Diffuser, a single-piece replacement valance with four centre strakes and tall wrap-around outer sections that rise into the rear quarters.

Manufactured from carbon fibre with a high-gloss twill finish, it fits in place of the factory valance on the original mounting points. The outer sections carry the carbon further up the bumper than most diffusers, so the rear reads as one continuous treatment rather than a strip along the bottom.

It suits an owner who wants a substantial rear change in one part, and it is the more restrained of the two RS5 diffuser styles we carry.

Key Features

Dry Carbon Fibre Construction

Manufactured using a dry carbon process, chosen for its rigidity and the depth of its finish under direct light.

Wrap Around Outer Sections

Tall outer sections rise into the rear quarters, carrying the carbon well above the base of the bumper.

Four Centre Strakes

Vertical fins across the centre section give depth and shadow to the lower rear.

Pre-Drilled Mounting Points

Mounting tabs are formed into the moulding at the factory locations, so the part locates against the bumper without fabrication.

High Gloss Twill Finish

A clear gloss finish over a consistent twill weave, matched to the look of factory Audi Sport carbon components.

Performance Benefits

Transformed Rear End

Replaces the full lower rear panel, changing the character of the back of the car in a single part.

Improved Aerodynamic Profile

Designed to complement the aerodynamic profile of the car and help manage airflow around it.

Lightweight Exterior Upgrade

Carbon fibre construction keeps the added mass minimal.

Completes Your Carbon Fibre Build

Matches the weave and finish of the rest of the Proven Performance Parts Audi carbon range for a consistent exterior package.

Vehicle Fitment

Audi B9.5 RS5 Coupe (2020+)

Audi B9.5 RS5 Sportback (2020+)

Select your body style at checkout. The Coupe and Sportback are not interchangeable on this part.

For the facelifted B9.5 rear bumper. The pre-facelift B9 uses a different valance and is not covered.

Please Note

Professional installation is strongly recommended.

The factory rear valance is removed. This is a replacement panel, not an overlay.

Parking sensors, where fitted, are transferred from the original valance.

Minor preparation, alignment or adjustment may be required during installation to achieve optimal fitment.

Due to the nature of carbon-fibre manufacturing, slight variations in weave pattern may occur between products.

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.