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

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

Engineered for Audi S3 8V, A3 8V and RS3 8V (2012-2020) owners, this Prepreg (Dry) Carbon Fiber Rear Diffuser transforms the rear end with motorsport-inspired aggression that goes far beyond the factory plastic part. Made to factory-spec tolerances by leading manufacturers around the world and quality-controlled by BYC Performance, this Audi 8V carbon rear diffuser bolts directly to OEM mounting points: no cutting, no drilling, no modification.

If you're building a serious Audi S3 tuning, A3 modification, or RS3 8V tuning project and want a part that visibly surpasses the OEM plastic diffuser, this dry carbon rear diffuser is built for you. From the A3's 1.4/2.0 TFSI EA888/EA211 powertrains, to the S3's 2.0 TFSI EA888 turbo (286-310 hp), to the legendary RS3 2.5 TFSI EA855 evo five-cylinder turbo (367-400 hp), autoclave-cured prepreg carbon technology delivers a noticeably lighter visual upgrade with outstanding UV resistance.

Key Features

• Prepreg (Dry) Carbon Technology: Pre-impregnated plies cured in an autoclave under high heat and pressure for a more consistent weave.
• Aggressive Diffuser Geometry: Race-inspired channels clean up rear underbody airflow and accelerate air at speed.
• Lightweight: Noticeably lighter than the factory plastic diffuser.
• High Strength: Carbon fiber offers very high strength for its weight.
• 2x2 Twill Carbon Weave: Authentic carbon pattern under a high-gloss UV-protective clear coat.
• Direct OEM Fit: Plug & play installation on factory Audi 8V Sportback and Sedan mounting points.
• UV & Chemical Protection: Long-life clear coat resists fading and exhaust/fuel 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, leaving air voids and inconsistent weight. 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 rear diffuser is a direct replacement of the OEM part. 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. Verify exhaust tips are centered in diffuser cutouts (S3 dual outlets, RS3 oval dual outlets).

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.

FAQ

Does it fit the RS3 8V?
Yes. This diffuser fits both the 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 bumper geometry; this part is 8V-specific.

Any difference between pre-facelift and facelift?
No. 2013-2016 pre-facelift and 2017-2020 facelift models share the same rear bumper and diffuser mounting geometry.

Will rain damage dry carbon parts?
No. Autoclave-cured prepreg carbon is fully waterproof and weather-resistant.

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?
Manufacturing defects 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 RS carbon diffusers, Audi S3 carbon parts, BMW M3 carbon diffusers, Porsche carbon spoilers, and many more high-quality carbon components. Every part we source undergoes strict quality control.