Audi A5 S5 LED rear diffuser: the S5 rear end with an added light signature
This rear diffuser for the Audi A5 S Line and S5 dresses the lower bumper of 2017 to 2020 models and adds an integrated LED strip that lights up with the lights. It is designed for bumpers intended for four exhaust outlets: the fins fit between the exhaust tips without obscuring them.
Why choose this rear diffuser
- Integrated LED lighting: a low light line that defines the width of the vehicle as soon as night falls.
- Deep vertical fins: the vocabulary of competition diffusers, adapted to the scale of the premium coupe.
- Two finishes: gloss black for a decidedly original look, carbon look for a more pronounced contrast.
- Four-outlet cutout: designed for double-exit bumpers, S Line and S5.
- UV-treated ABS: the color does not fade after two summers of outdoor parking.
- Bottom-mounted: high-strength adhesive and screws in existing points, without removing the bumper in most cases.
A body kit that finishes the rear of the A5 Coupe and Sportback
A rear diffuser is the element placed under the bumper, between the exhaust outlets, whose role is to organize the airflow under the car and, visually, to widen the rear. On an Audi A5 S Line, the original lower bumper remains modest: this diffuser gives it the depth it lacks. On an Audi S5, it highlights the four exhaust tips. Unlike a simple sticker spoiler, it follows the exact curvature of the bumper and the red LED lighting extends the rear light signature.
Technical specifications
Type: illuminated rear diffuser
Compatibility: Audi A5 S Line and S5, four-outlet bumpers
Years: 2017-2020
Material: UV-resistant ABS
Finishes: gloss black or carbon look
Lighting: 12 V LED strip to be connected to the lights
Condition: 100% New
Installation and connection
Allow 1.5 to 2 hours. The diffuser comes in white under the bumper, is fixed with double-sided adhesive and screws, then the LED wiring harness is connected to the 12 V of the rear light or license plate lighting. Pass the cable through an existing grommet, never through a sharp edge, and protect the connection with heat-shrink tubing. Professional installation is still recommended for the electrical part. Compatibility should be checked according to the version and exhaust configuration before installation.
Frequently asked questions
Is the LED lighting road legal?
A light strip added to the rear is not covered by the vehicle's type approval. Reserve it for track use or display, or check with the technical inspection.
Will it fit an A5 with two exhaust outlets?
No. The cutout corresponds to bumpers designed for four outlets. Compare your bumper to the photos before ordering.
Do you need to remove the bumper to install it?
In most cases, no: the mounting is done from underneath. Removing it simply makes it easier to route the power cable.
Does the diffuser withstand high-pressure washing?
Yes, by keeping a distance of about thirty centimeters and avoiding directing the jet at the electrical connections.
Which finish ages best?
Gloss black scratches more easily but can be polished; the carbon look better hides the micro-scratches on the lower bodywork.
Finish the rear of your A5 as Audi should have done: a deep diffuser, four highlighted outlets, a light line that defines the car at night.
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