Audi A4 S-Line / S4 B9 Carbon Fibre Rear Bumper Diffuser

Transform the rear end of your Audi into a statement of purposeful aggression with this precision-engineered carbon fibre rear bumper diffuser. Designed to complement the S-Line and S4 aesthetic, this piece adds an unmistakable motorsport-inspired edge that sets your car apart from the crowd without compromise.

Hand-crafted using a genuine carbon fibre construction with a stunning 3x3 twill weave finish, this diffuser delivers the kind of visual drama that turns heads at every opportunity. The deep gloss surface catches light beautifully, adding depth and drama to the lower rear section of your vehicle in a way no OEM component ever could.

Installation is refreshingly straightforward — every fitting hardware you need is included in the package, meaning no specialist tools or costly bodywork modifications are required. Each piece is developed using CNC-precision moulds and test-fitted on real vehicles, ensuring an OEM-grade, flush fit that looks factory from day one.

Elevate your Audi's rear presence with a part that combines visual impact, quality craftsmanship, and effortless installation. Add this carbon fibre diffuser to your build today and complete the look your car deserves.

Audi A4 B9 S-Line / S4 Sedan (2017-2019)

3x3 Twill Weave Carbon Fibre with Gloss Clearcoat

Vanté ships worldwide. All international orders include DDP shipping (Delivered Duty Paid) — no import duties, customs fees, or unexpected charges on delivery. What you pay at checkout is what you pay, wherever you are. A small number of products are exempt from this; please contact us if in doubt.

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.