Audi S4 B9 Carbon Fibre Rear Bumper Diffuser with Splitter

Elevate the rear stance of your S4 with this precision-crafted carbon fibre rear bumper diffuser and splitter combination. Designed to inject a genuine motorsport aesthetic into the rear end, the aggressive channelled diffuser and integrated splitter work in harmony to create a look that commands attention from every angle.

Every panel is hand-laid to achieve a flawless surface finish, ensuring the weave pattern is consistent and visually striking. The result is a piece that looks and feels every bit as premium as the car it adorns — a true upgrade over the factory bumper that transforms the rear profile from reserved to purposeful.

Engineered for a precise, OEM-grade fitment, this diffuser mounts directly to the factory bumper locations without any cutting, drilling, or modification. The lightweight construction makes a meaningful difference to the overall rear weight distribution, complementing both road and track driving dynamics.

Whether you're building a show car or a fast road weapon, this rear diffuser and splitter set is the finishing touch that completes the look. Add it to your build today and experience the transformation firsthand.

Audi S4 B9 (2017-2018)

Carbon Fibre with Gloss Clearcoat

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Delivery estimates

Estimated delivery dates are shown on each product page and reflect the full manufacturing and shipping timeline. These are accurate to each product type and updated regularly.

Manufactured to order

The majority of our catalogue is produced to order. This ensures every component is made fresh to specification. Delivery estimates on each product page account for this production time in full.

Express shipping

Express shipping is available on selected products and will appear as an option at checkout where applicable.

Stock availability

Occasionally items may be available for faster dispatch from existing stock. If you need a part urgently, reach out before ordering and we'll confirm availability.

Vanté Automotive does not accept any liability for damage caused to a vehicle during installation of this product. Professional installation is recommended for all products. By purchasing this product you agree to these terms.