Audi S4 / A4 B9 / B9.5 | Prepreg Dry Carbon Fiber Front Lip

Audi S4/A4 B9/B9.5 (2015-2023) Prepreg Dry Carbon Fiber Front Lip

Engineered for Audi S4/A4 B9 and B9.5 (2015-2023) sedan and Avant owners, this Prepreg Dry Carbon Fiber Front Lip mounts to the lower edge of the front bumper and brings aggressive, low-slung race styling to your sport sedan or wagon. Imported from leading manufacturers around the world and quality-controlled by BYC Performance, this Audi B9 carbon front lip bolts directly to OEM lower-bumper mounting points: no cutting, drilling, or modification required.

If you're working on an Audi S4 B9 tuning or A4 B9.5 modifying project and want a low-profile splitter on the front bumper, this dry carbon front lip is for you. Autoclave-cured prepreg carbon is noticeably lighter than wet-lay parts, with superior structural integrity and outstanding UV resistance. The aggressive lip geometry complements the S4 B9's 3.0 TFSI V6 single-turbo (349-354 hp) sport-sedan character and adds front-axle downforce, a meaningful visual and aerodynamic upgrade.

Key Features

• Prepreg Dry Carbon Technology: Pre-impregnated plies cured in an autoclave under high heat and pressure for a more consistent weave.
• Splitter Geometry: Slim splitter extending forward from the bumper underside, noticeably lighter than the factory plastic equivalent.
• Race-Grade Strength: Carbon fiber offers very high strength for its weight.
• Aerodynamic Effect: Directs airflow under the front bumper for front-axle downforce and reduced nose lift at speed.
• 2x2 Twill Carbon Weave: Authentic carbon pattern under a high-gloss UV-protective clear coat.
• Direct OEM Fit: Plug & play on Audi A4 / S4 B9 and B9.5 (2015-2023) sedan and Avant lower front-bumper mounting points.
• UV & Chemical Protection: Clear coat resists fading, cracking, fuel splash, and road tar.

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

Most aftermarket carbon parts use wet lay-up, with resin applied by hand and cured at room temperature. Prepreg dry carbon:

• Autoclave-cured 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

The Audi S4/A4 B9 carbon front lip installs to the factory bumper underside via clips and screws. Professional installation recommended.

1. Clean the lower bumper surface with isopropyl alcohol.
2. Test-fit the lip for left/right symmetry.
3. Secure with supplied hardware to the manufacturer's recommended torque.
4. Press 3M-tape sections firmly into position.
5. Avoid washing the car for 24 hours to allow the adhesive to set fully.

Care & Maintenance

Wash with pH-neutral car shampoo. Apply carbon-safe sealant every 6 months. Keep pressure washer nozzle at least 30 cm from surface. Take care over high curbs and steep ramps due to the low lip profile.

FAQ

Does this lip fit both B9 and B9.5?
Yes. The lower-bumper profile where the lip mounts is shared between B9 pre-facelift (2015-2019) and B9.5 facelift (2019-2023).

Compatible with RS4 Avant?
No. The RS4 B9/B9.5 factory front bumper has different lower geometry; RS4 owners should contact BYC for front-lip options.

Compatible with A4 Avant (wagon)?
Yes. A4 Sedan and Avant share the same front bumper; both body styles are fully compatible.

Compatible with previous-generation B8/B8.5?
No. B8/B8.5 (2008-2015) is an entirely different platform.

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. International shipping available. 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 B9 carbon parts, Audi RS carbon diffusers, BMW M3 carbon spoilers, Porsche carbon front lips, and many more high-quality carbon components. All parts are sourced from leading manufacturers around the world and undergo strict quality control.