Aggressive Carbon Fiber Rear Diffuser w/ Brake Light - Audi A4 S4 Sedan (2015-2020) B9

Command attention with the Aggressive Carbon Fiber Rear Diffuser featuring an integrated brake light for your Audi A4/S4 B9 Sedan. This extreme design pushes the boundaries with dramatically deeper fins, a more pronounced central section, and an integrated LED brake light that enhances both style and safety. The aggressive geometry creates a race-ready aesthetic that significantly transforms your vehicle's rear profile while providing improved visibility to following traffic through the sleek, integrated lighting.

Masterfully constructed from premium 2x2 twill carbon fiber, this diffuser features a flawless weave pattern protected by a high-gloss UV-resistant clear coat. The integrated LED brake light is seamlessly incorporated into the design, providing bright illumination while maintaining the diffuser's aggressive lines. This complete direct replacement unit arrives fully assembled and ready for professional installation.

Key Features

• Fits Audi A4, S4 B9 Sedan (2015-2020)

• Ultra-aggressive multi-fin design with deeper, more pronounced geometry

• Premium 2x2 twill carbon fiber construction – flawless finish and reduced weight

• Integrated LED brake light for enhanced safety and modern appearance

• Direct OEM replacement – complete unit ready for installation

Production & Lead Time
Each rear diffuser is made to order, with a lead time of 2–6 weeks.

Lifetime Warranty
Includes a lifetime warranty against manufacturing defects, valid only when installed by AR Bodyworks.

Vehicle Fitment

• Audi A4, S4 B9 Sedan (2015-2020)