2017 - 2024 Audi RS4 B9 Carbon Fiber Rear Diffuser Trim Lip

Upgrade the rear aesthetic of your Audi RS4 B9 with this carbon fiber rear diffuser trim lip. Designed to add a premium motorsport-inspired detail to the factory diffuser setup, this trim lip enhances the rear-end profile with a sharper and more aggressive appearance.

The rear diffuser trim lip is designed to subtly improve aerodynamic flow presence while refining the lower rear bumper area. Its carbon fiber finish adds visual depth and a cohesive performance look, making it an ideal upgrade for owners looking to enhance rear styling without replacing the full diffuser assembly.

Constructed from CFRP or FGCF material options, this rear diffuser trim lip set delivers lightweight construction, durable quality, and premium exterior appeal. Designed for 2017-2024 Audi RS4 B9 models, each package includes one set of rear diffuser trim lip.

Product Specifications

Key Features

• Carbon fiber rear diffuser trim lip designed for the Audi RS4 B9
• Designed for 2017-2024 Audi RS4 B9 models
• Adds a premium motorsport-inspired detail to the factory diffuser setup
• Available in CFRP and FGCF material options
• Enhances the rear diffuser area with carbon fiber styling
• Creates a cleaner, sharper, and more aggressive rear-end appearance
• Subtly improves aerodynamic flow presence around the rear diffuser area
• Designed for exact fitment and clean installation
• Ideal for rear styling upgrades and carbon fiber exterior packages
• Includes one set of rear diffuser trim lip

Configuration Options

• Material Option: Available in CFRP or FGCF material options
• Rear Trim Setup: Designed as a trim lip add-on for the RS4 B9 rear diffuser area
• Exterior Styling: Carbon fiber and forged carbon fiber finishes add a premium motorsport-inspired rear detail
• Package Setup: Includes one set of rear diffuser trim lip

Package Includes

• One set of rear diffuser trim lip

Note: Professional installation is recommended. Test fitting is recommended before final installation. This rear diffuser trim lip is designed to enhance the Audi RS4 B9 rear diffuser area with carbon fiber detailing. Final fitment may require minor adjustments depending on the vehicle and selected material option.

Installation

• Designed for installation on the rear diffuser 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.