2017 - 2024 Audi RS4 B9 BKSS Style Rear Diffuser with Winglets

Elevate the rear design of your Audi RS4 B9 with this BKSS Style carbon fiber rear diffuser with winglets. Designed to add bold race-inspired styling, this rear diffuser set transforms the lower bumper area with a sharper and more aggressive performance-focused appearance.

The BKSS Style rear diffuser is designed to enhance aerodynamic presence while adding visual depth to the RS4’s rear profile. Integrated LED lighting adds a modern motorsport detail, while the included rear winglets complete the aggressive rear-end look for a dynamic exterior upgrade.

Crafted from CFRP, FGCF, or DryCF material options, this rear diffuser set delivers lightweight construction, durable quality, and premium exterior appeal. Designed for 2017-2024 Audi RS4 B9 models, each package includes one rear diffuser with LED light and one pair of rear winglets.

Product Specifications

Key Features

• BKSS Style rear diffuser with winglets designed for the Audi RS4 B9
• Designed for 2017-2024 Audi RS4 B9 models
• Adds bold race-inspired rear-end styling
• Available in CFRP, FGCF, and DryCF material options
• Includes integrated LED lighting for a modern performance detail
• Includes rear winglets to complete the aggressive rear profile
• Enhances the rear lower bumper area with premium carbon fiber styling
• Improves aerodynamic presence and rear visual depth
• Designed for precise fitment and clean installation
• Includes one rear diffuser with LED light and one pair of rear winglets

Configuration Options

• Material Option: Available in CFRP, FGCF, or DryCF material options
• Rear Diffuser Setup: BKSS Style rear diffuser enhances the RS4 B9 lower rear bumper profile
• Lighting Setup: Integrated LED light adds a modern rear-end detail
• Winglet Setup: Includes one pair of rear winglets for a more aggressive finish
• Exterior Styling: Carbon fiber, forged carbon fiber, and dry carbon fiber finishes add a premium motorsport-inspired rear detail

Package Includes

• One rear diffuser with LED light
• One pair of rear winglets

Note: Professional installation is recommended. Test fitting is recommended before final installation. This rear diffuser with winglets is designed to enhance the Audi RS4 B9 rear-end styling 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 rear lower bumper area
• Professional installation is recommended for proper alignment, wiring, and secure fitment
• Test fit all components and test LED lighting before final installation
• 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.