2017 - 2024 Audi RS4 B9 BKSS Style Side Skirts Under Board

Enhance the side profile of your Audi RS4 B9 with these BKSS Style carbon fiber side skirts under board. Designed to add a sleek and aggressive aerodynamic edge, these side skirts give the RS4 a lower and more track-inspired exterior stance.

The BKSS Style side skirts under board are designed to improve side aero presence and high-speed stability styling while maintaining daily drivability. Their extended under board profile complements the RS4 B9’s factory body lines, creating a clean and performance-focused side appearance.

Crafted from CFRP, FGCF, or DryCF material options, these side skirts deliver lightweight construction, durable quality, and premium exterior appeal. Designed for 2017-2024 Audi RS4 B9 models, each package includes one pair of side skirts under board.

Product Specifications

Key Features

• BKSS Style side skirts under board designed for the Audi RS4 B9
• Designed for 2017-2024 Audi RS4 B9 models
• Adds a sleek and aggressive side profile
• Available in CFRP, FGCF, and DryCF material options
• Enhances the lower side skirt area with premium carbon fiber styling
• Extended under board design provides a track-inspired appearance
• Improves side aero presence and high-speed stability styling
• Complements the RS4 B9 factory body lines
• Designed for clean fitment and a factory-like finish
• Includes one pair of side skirts under board

Configuration Options

• Material Option: Available in CFRP, FGCF, or DryCF material options
• Side Aero Setup: BKSS Style side skirts under board enhance the RS4 B9 lower side profile
• Under Board Design: Extended under board profile adds a more track-inspired side appearance
• Exterior Styling: Carbon fiber, forged carbon fiber, and dry carbon fiber finishes add a premium motorsport-inspired side detail
• Package Setup: Includes one pair of side skirts under board

Package Includes

• One pair of side skirts under board

Note: Professional installation is recommended. Test fitting is recommended before final installation. These side skirts under board are designed to enhance the Audi RS4 B9 side profile with BKSS-inspired carbon fiber detailing. Final fitment may require minor adjustments depending on the vehicle and selected material option.

Installation

• Designed for installation on the lower side skirt area
• Professional installation is recommended for proper alignment and secure fitment
• Test fitting is recommended before final mounting
• Some adjustment may be required during installation for best results

Fitment

• 2017-2024 Audi RS4 B9

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.