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A Lower, More Defined Side Profile
Give your Audi A4 or S4 a more planted appearance with model-specific carbon fiber side skirt extensions. The lightweight left-and-right set follows the B9/B9.5 Sedan body line without replacing the original rocker panels.
Real Dry Carbon Fiber
Made from genuine 3K dry carbon fiber for a lightweight structure, visible woven pattern and premium exterior finish.
Model-Specific Shape
Contoured for compatible Audi A4 and S4 B9/B9.5 Sedans to create a balanced extension along both sides.
Glossy or Matte
Choose a glossy finish for stronger reflections or a matte finish for a more understated performance look.
Designed to Complete the Side View
The factory rocker area can appear visually high compared with an upgraded front lip or rear diffuser. These Audi A4 carbon fiber side skirts extend the lower body line and help connect the front and rear styling for a more cohesive OEM+ appearance.
This product is an add-on side skirt extension set. It installs along the lower edge of the original side skirts rather than replacing the factory rocker panels.
Vehicle Compatibility
| Vehicle | Chassis | North American Model Years | Body Style |
|---|---|---|---|
| Audi A4 | B9 / B9.5 | 2017–2024 | Sedan |
| Audi S4 | B9 / B9.5 | 2018–2024 | Sedan |
Choose Your Carbon Finish
Add-On Installation
The extensions are installed using automotive adhesive tape together with compatible original lower mounting points. They do not replace the factory side skirts.
- Identify the driver- and passenger-side extensions and complete a full test fit.
- Clean and dry all adhesive contact areas thoroughly.
- Align both sides and mark the final mounting positions.
- Apply the supplied automotive adhesive tape to the designated contact areas.
- Reuse compatible original underside screws or fasteners to secure the extensions.
- Check alignment and allow the adhesive to set before driving or washing the vehicle.
What’s Included
- 1 × Driver-side carbon fiber side skirt extension
- 1 × Passenger-side carbon fiber side skirt extension
- Automotive installation tape
Original vehicle fasteners are reused where applicable.
Frequently Asked Questions
Are these replacement side skirts?
No. These are add-on extensions installed along the lower edge of the original side skirts.
Do they fit both B9 and B9.5 models?
Yes, they are designed for the compatible B9 and B9.5 A4/S4 Sedan configurations listed in the fitment table.
Will they fit an A4 allroad or Avant?
No. This version is intended for the Sedan body style and is not compatible with allroad, Avant or Wagon models.
Is drilling required?
The extensions are designed to use adhesive tape and compatible original mounting points. Cutting or drilling should not be required when the vehicle matches the listed configuration, but a complete test fit must be performed before installation.
What is the difference between glossy and matte?
Both options use real carbon fiber. Glossy produces stronger reflections and a deeper-looking weave, while matte provides a softer, lower-reflection finish.
Complete Your B9/B9.5 Exterior
Add a real carbon fiber lower profile that visually connects your Audi’s front, side and rear styling.
This is an aftermarket component manufactured by Asign. Audi model names are used only to identify vehicle compatibility. Asign is not affiliated with or endorsed by Audi AG.
