Audi S4 Avant B9.5 BKSS Style Carbon Fiber Add-On Side Skirt Under Boards 2020-2025

Upgrade the side profile of your 2020-2025 Audi S4 Avant B9.5 with these BKSS Style Carbon Fiber Add-On Side Skirt Under Boards. Designed to enhance the factory side skirt area, these under boards add a lower, sharper, and more performance-focused exterior appearance.

This package includes one pair of add-on side skirt under boards engineered for the Audi S4 Avant B9.5. The BKSS style design gives the wagon a more aggressive side profile while complementing the clean body lines of the B9.5 platform.

Available in CFRP, FGCF, and DryCF material options, these carbon fiber side skirt under boards are built for premium appearance, lightweight strength, and long-term durability. Professional installation is recommended to ensure accurate alignment, secure mounting, and a clean finished fit.

Product Specifications

Key Features

• Designed for 2020-2025 Audi S4 Avant B9.5 models
• BKSS style design for a sharper and more aggressive side profile
• Add-on side skirt under board design enhances the lower side body lines
• Available in CFRP, FGCF, and DryCF material options
• Lightweight carbon fiber construction designed for premium exterior styling
• Complements the factory shape of the Audi S4 Avant B9.5 platform
• Ideal for owners looking to add a clean motorsport-inspired carbon fiber upgrade

Configuration Options

• CFRP: Carbon fiber reinforced polymer option for a premium carbon-style exterior finish
• FGCF: Fiberglass carbon fiber option for a balanced construction and carbon fiber appearance
• DryCF: Dry carbon fiber option for a lightweight, high-end finish

Package Includes

• One pair of add-on side skirt under boards

Note: Professional installation is recommended for best fitment, alignment, and secure mounting. Made-to-order material options may require additional production time before shipping.

Installation

• Test fit both side skirt under boards before final installation
• Clean and prepare all mounting surfaces before installation
• Align both pieces carefully before securing for a balanced side profile
• Professional installation is recommended for proper fitment and long-term durability

Fitment

• 2020-2025 Audi S4 Avant B9.5

United States: Free shipping available to the lower 48 states across all items. Other states will incur a shipping charge.

Worldwide: Free shipping is available for Complete Headlights, Taillights, DRLs. For custom headlight retrofits, carbon fiber products, and performance products, there will be a shipping charge.  

Please note:
• For Retrofits, you are purchasing a headlight modification service.
• If you select "Shipping own headlights to BayOptiks for modification", you are required to send us your headlights.
• If you choose "Purchase new OEM headlights", we will order and modify a new OEM headlight for you.
• Once your customizations are complete, we will ship it to you!

• Complete Headlights: 3-5 business days for order processing plus shipping time.
• Custom & Pre-Built Headlights: 6-8 weeks depending on the complexity and component availability.
• New OEM and cores: 6-8 weeks plus an additional 4-8 weeks as these are special orders base on the vehicle VIN due to different versions (North American, European, etc.)
• DRLs, Taillights, Brake Pads, and Carbon Fiber Aero: 3-5 business days for order processing, plus shipping time.
• Lens Replacements: 1-3 weeks plus shipping time.

Please note, we do not have control over the time frames of our vendors, manufacturers, and delivery services as they may delay processes in regards to components and shipment.