Rear Diffuser – Audi A5 S line / S5 B9 (2018–19)

A rear diffuser lip that adds a sharper lower edge to the pre-facelift A5 S line and S5 rear bumper. Choose gloss black or real carbon fiber.

Fits

• Audi A5 with the S line rear bumper and S5, B9 (pre-facelift), 2018–2019, Sportback (4-door) and coupe (2-door)

Does not fit

• Base (non-S line) bumpers
• RS5
• 2020–2024 facelift A5 / S5
• Cabriolet

Material & finish

Gloss black: painted fiberglass (FRP). Real carbon fiber: 2x2 twill weave with a UV-protective gloss clear coat.

In the box

1 rear diffuser lip with self-tapping screws and adhesive tape.

Install

Direct fit, no cutting. Mounts under the factory rear bumper with tape and screws. Professional install recommended.

Shipping: Ships with tracking. Made to order, so allow 2–5 weeks.

Every part is direct fit, with no cutting. The product details above say how this one mounts: tape, clips or screws.

Before you peel any tape: test-fit the part, clean the surface with isopropyl alcohol, and install above 60°F so the adhesive bonds. Lips, splitters and diffusers take longer and may need small pilot holes, and LED parts need wiring, so we recommend a professional install for those.

Not sure it's right for your car? Message us your year and trim before you order.

Every order ships with tracking. Most orders arrive in 1–3 weeks. Parts marked "Ships from a US warehouse" usually arrive faster. Spoilers, lips and diffusers ship separately because of their size.

Fitment guarantee: if a part doesn't fit the car and years it's listed for, contact us before installing and we'll refund you.

See our Shipping Policy and Refund Policy for details.