Audi RS3 8Y.5 Sedan AD Style Autoclave Carbon Fiber Rear Diffuser 2025-2026

Enhance the rear styling and aerodynamic performance of your 2025–2026 Audi RS3 8Y.5 Sedan with this AD Style autoclave carbon fiber rear diffuser. Designed to refine the lower rear bumper area, this upgrade adds a more aggressive and performance-oriented appearance while maintaining clean OEM-style integration.

This rear diffuser is precision-engineered to align with the factory mounting points of the RS3 8Y.5 rear bumper, ensuring a secure fit and seamless installation. The AD style design improves airflow management and enhances the visual depth of the rear profile, creating a more track-inspired look.

Constructed using advanced autoclave dry carbon fiber manufacturing, this diffuser offers superior strength, reduced weight, and consistent weave quality. Available in multiple dry carbon finishes, it is an ideal upgrade for enthusiasts seeking a premium OEM+ aesthetic for both daily driving and performance builds.

Product Specifications

Key Features

• Designed for 2025–2026 Audi RS3 8Y.5 Sedan models
• AD style rear diffuser for enhanced rear styling and aerodynamics
• Autoclave dry carbon fiber construction for lightweight strength and durability
• Available in standard and forged dry carbon fiber finishes
• Precision-engineered for OEM-style fitment and seamless integration
• Utilizes factory mounting points for secure installation
• Improves rear airflow management and aerodynamic efficiency
• Enhances rear bumper definition and aggressive appearance
• Suitable for street use, show builds, and performance applications

Configuration Options

• DRYCF – Traditional dry carbon fiber weave with a high-gloss finish
• DRYFGCF – Forged dry carbon fiber with a unique marbled appearance

Package Includes

• Rear diffuser

Note: This is a made-to-order product. Production is required prior to shipping. This diffuser fits RS3 8Y.5 Sedan models only. Professional installation is recommended to ensure proper alignment and secure mounting.

Installation

• Direct installation using original factory screw holes
• No drilling required
• No cutting required
• Uses factory mounting points
• Professional installation recommended

Fitment

• 2025–2026 Audi RS3 8Y.5 Sedan

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.