Audi S4 Avant B9 B9.5 BKSS Style Carbon Fiber Trunk Spoiler 2017-2025

Enhance the rear styling and aerodynamic profile of your 2017-2025 Audi S4 Avant B9 and B9.5 with this BKSS style carbon fiber trunk spoiler. Designed to add a sportier and more aggressive touch, this spoiler improves rear-end definition while maintaining a clean OEM+ appearance.

Engineered specifically for the S4 Avant platform, this trunk spoiler follows the factory rear hatch contours for precise fitment and seamless integration. The BKSS style design delivers a sharper and more dynamic look, making it ideal for both daily driving and performance-inspired builds.

Constructed from high-quality carbon fiber materials, this spoiler offers lightweight durability, strength, and a premium finish. Available in multiple carbon fiber options, it ensures long-term performance and reliability while enhancing the vehicle’s overall rear profile.

Product Specifications

Key Features

• Designed for 2017-2025 Audi S4 Avant B9 and B9.5 models
• BKSS style trunk spoiler for enhanced sporty styling
• Improves rear aerodynamics and airflow
• Precision fitment aligned with factory rear hatch lines
• Constructed from high-quality carbon fiber materials
• Available in multiple carbon fiber finishes
• Lightweight and durable construction
• Enhances rear profile and visual presence
• OEM+ fit and seamless integration
• Suitable for daily driving and performance builds

Configuration Options

• CFRP – Standard carbon fiber construction with gloss finish
• FGCF – Fiberglass reinforced carbon fiber option
• Dry Carbon – Lightweight pre-preg carbon fiber with premium finish

Package Includes

• Trunk spoiler

Note: Professional installation is recommended to ensure proper alignment and secure adhesion.

Installation

• Adhesive installation
• Double-sided tape recommended
• No drilling required
• No cutting required
• No permanent modification required
• Professional installation recommended

Fitment

• 2017-2025 Audi S4 Avant B9
• 2017-2025 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.