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

Upgrade your Audi RS4 B9’s rear aesthetic with the Carbon Fiber Rear Diffuser Trim Lip. Constructed from lightweight and durable CFRP and FGCF materials, this trim lip enhances the vehicle’s rear-end styling while subtly improving aerodynamic flow. Its carbon finish adds a premium motorsport touch to the factory diffuser setup.

Engineered for 2017–2024 Audi RS4 B9 models, the trim set offers an exact fit and installs cleanly to deliver a cohesive, aggressive look.

Fitment: 2017-2024 Audi RS4 B9
Package Content: One set of rear diffuser trim lip

Made To Order Shipping Information Made-to-Order Items: If a material option shows "MADE TO ORDER", it means that specific option is currently out of stock and will be produced upon order. Customers can choose from the following shipping methods: * Standard Shipping And Handling (no extra cost) with an ETA of 3-4 months. * Expedited Shipping And Handling (additional cost: $550) with an ETA of 5-6 weeks. In-Stock Items: If a product does not display "Made To Order" when selecting a material option, then it is in stock. It will be shipped from our warehouses within 3-5 business days, plus shipping time.

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.