Audi S4 Avant B9.5 BKSS Style Carbon Fiber Full Body Kit 2020-2025

Upgrade the exterior profile of your 2020-2025 Audi S4 Avant B9.5 with this BKSS Style Carbon Fiber Full Body Kit, designed to add a sharper and more aggressive performance-inspired appearance from front to rear.

This full body kit is designed specifically for Audi S4 Avant B9.5 models, combining a front lip, rear diffuser with exhaust tips, and side skirt under boards into one coordinated carbon fiber exterior package. The BKSS Style design enhances the lower body lines while complementing the clean factory styling of the S4 Avant.

Constructed from carbon fiber material options, this body kit is ideal for Audi owners looking to complete a premium exterior carbon package, refine the vehicle’s stance, or add a more dynamic aero-inspired finish. Professional installation is recommended to ensure proper alignment, secure mounting, and clean fitment across all components.

Product Specifications

Key Features

• Designed for 2020-2025 Audi S4 Avant B9.5 models
• BKSS Style full body kit adds a sharper and more aggressive lower exterior profile
• Includes front lip, rear diffuser with exhaust tips, and side skirt under boards
• Carbon fiber material options provide a premium performance-inspired exterior finish
• Enhances the front, side, and rear lower body lines of the S4 Avant
• Rear diffuser with exhaust tips adds a more complete performance-style rear appearance
• Ideal for exterior carbon fiber packages, aero styling upgrades, and custom Audi builds

Configuration Options

• CFRP material option
• FGCF material option
• DryCF material option

Package Includes

• One front lip
• One rear diffuser with exhaust tips
• One pair of side skirts under board

Note: Professional installation is recommended to ensure proper component alignment, secure mounting, exhaust tip positioning, and clean fitment across the front lip, side skirts, and rear diffuser. Test fitting is recommended before final installation.

Installation

• Carbon fiber full body kit installation
• Includes front lip, side skirt under board, and rear diffuser installation
• Check rear diffuser and exhaust tip alignment before final mounting
• Clean and prepare all mounting surfaces before installation
• Test fit each component before final mounting to confirm placement and alignment
• Professional installation is recommended for best results

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.