Audi S3 / A3 / RS3 8V | Prepreg Dry Carbon Fiber LED Rear Diffuser

Audi S3/A3/RS3 8V (2012-2020) Prepreg Dry Carbon Fiber LED Rear Diffuser

Engineered for Audi S3 8V, A3 8V and RS3 8V (2012-2020) owners, this Prepreg Dry Carbon Fiber LED Rear Diffuser adds race-inspired aggression to the rear while integrating a built-in LED module that elevates night-time visibility and visual impact. Made to factory-spec tolerances by leading manufacturers around the world and quality-controlled by BYC Performance, this Audi 8V carbon LED diffuser bolts directly to OEM mounting points and is a distinct SKU from the non-LED rear diffuser in our catalog.

The LED module is designed to function as a third brake light / fog light; the steps for the OEM harness connection are in the installation notes on this page. Character match is excellent with RS3 8V's 2.5 TFSI EA855 evo five-cylinder inline turbo engine (367-400 hp) and S3 8V's 2.0 TFSI EA888 turbo (286-310 hp); for the A3 8V it provides a tuning identity that clearly separates from the OEM look. Autoclave-cured prepreg carbon is noticeably lighter than wet lay-up carbon, stronger, and UV-resistant.

Key Features

• Prepreg Dry Carbon Technology: Carbon plies cured in an autoclave under high heat and pressure.
• Integrated LED Module: Factory-mounted LED for third brake / fog light functionality. 12V DC, low draw.
• Aggressive Diffuser Geometry: Race-inspired channels support rear underbody aerodynamics.
• Lightweight: Noticeably lighter than the factory plastic diffuser.
• 2x2 Twill Carbon Weave: Authentic carbon pattern under a high-gloss UV-protective clear coat.
• Direct OEM Fit: Plug & play to factory S3/A3/RS3 8V rear bumper mounting points.
• UV & Chemical Protection: Long-life clear coat resists fading, cracking, and exhaust splash.

Prepreg Dry Carbon vs. Wet Carbon: Which Is Better?

Most aftermarket carbon parts are produced using wet lay-up, where resin is applied by hand and cured at room temperature. Prepreg dry carbon:

• Cured in an autoclave under high heat and pressure → a more consistent weave
• A controlled resin ratio → lighter and stronger
• The production method widely chosen in motorsport
• Minimal UV fading over years of use

Installation Notes

Installing the Audi 8V carbon LED diffuser is a direct replacement of the OEM part plus LED wiring. Professional installation is recommended:

1. Raise the vehicle and remove the rear bumper underbody screws.
2. Detach the OEM plastic diffuser from clips and bolts.
3. Test-fit the carbon diffuser for alignment.
4. Secure with supplied hardware to the manufacturer's recommended torque.
5. Tap the LED feed from the vehicle fuse box at a 12V source; parallel to the brake signal line (third brake mode) or to a switched fog circuit.
6. Secure the ground to a solid chassis point; verify connector insulation.

Care & Maintenance

Wash with pH-neutral car shampoo. Apply carbon-safe sealant every 6 months. Keep pressure washer nozzle at least 30 cm from the surface. The LED module is IP67 rated, but avoid aiming high-pressure water directly at the connector.

FAQ

How does it differ from the non-LED version?
This SKU includes the LED module; the non-LED diffuser is a plain carbon panel. Mounting geometry is identical, but LED integration makes this a separate SKU.

Does it fit the RS3 8V?
Yes. Compatible with both RS3 Sportback (2015-2017) and RS3 Sedan (2017-2020).

Does it fit both Sportback and Sedan?
Yes. A3/S3 8V Sportback and Sedan body styles share the same rear diffuser mounting points.

Does it fit the Audi 8Y (2020+)?
No. 8Y is the next-generation chassis with different rear bumper geometry.

Where do I tap the LED power?
From the vehicle fuse box at a 12V source; parallel to the brake signal or via a dedicated switch. Professional electrical work is recommended.

Will rain damage dry carbon parts?
No. Autoclave-cured prepreg carbon is fully waterproof. The LED module is IP67 rated.

Shipping time?
In-stock items ship within 1-3 business days via partner couriers. 1-2 day delivery across Turkey. Parts sourced to order are delivered within 30 days of the order date at the latest.

Warranty?
The carbon structure and the LED module are covered by a 24-month BYC warranty, in addition to your legal rights.

Why BYC Performance?

BYC Performance is a Turkey-based performance tuning specialist sourcing premium carbon fiber parts from leading manufacturers around the world and supplying them to the Turkish market. Our catalog includes Audi RS3 carbon LED diffusers, Audi RS carbon parts, BMW M3 carbon diffusers, Porsche carbon spoilers, and many more high-quality carbon components. All parts are sourced from leading manufacturers around the world and undergo strict quality control.