Mesh-Vented Carbon Fiber Rear Diffuser for Audi A5 S Line / S5 B9

Upgrade the rear profile of your Audi with this mesh-vented carbon fiber rear diffuser, designed for compatible 2017–2019 Audi A5 S Line and S5 B9 rear bumper configurations. The full-width one-piece design combines a long horizontal mesh opening with a multi-fin center section and large left and right exhaust openings.

Unlike rear bumper side splitters or LED-equipped diffuser designs, this rear diffuser uses an integrated full-width layout with a clean mesh-vented upper section and multiple vertical fins through the center.

Vehicle Fitment

• 2017–2019 Audi A5 B9 with compatible S Line rear bumper
• 2017–2019 Audi S5 B9 with compatible rear bumper configuration

Rear bumper and exhaust configurations can vary by body style and market. Please confirm your exact year, model, trim, body style and rear bumper shape before ordering.

Product Details

• Product Type: Rear Bumper Diffuser
• Style: Mesh-Vented / Multi-Fin
• Configuration: Full-width one-piece design
• Material: Carbon Fiber
• Finish: Gloss carbon fiber finish
• Exhaust Layout: Large left and right exhaust openings
• Approx. Size: 154.9 cm × 42.5 cm
• Installation: Vehicle-specific mechanical mounting

Mesh-Vented Multi-Fin Design

A long horizontal mesh opening runs across the upper center section of the diffuser, creating the most distinctive visual feature of this design. Below it, multiple vertical diffuser fins form a deeper and more defined center section while maintaining a balanced full-width appearance.

The mesh-vented multi-fin design also helps distinguish this product from other Audi A5 / S5 B9 rear diffuser options, including LED brake-light diffusers and different full-carbon or FRP diffuser styles.

Full-Width Rear Bumper Design

This product replaces the visual profile of the complete lower rear bumper section rather than adding small individual corner pieces. The integrated left and right exhaust openings, center fins and upper mesh section form a single continuous rear diffuser assembly.

If you are looking for separate rear bumper corner splitters instead of a complete diffuser, confirm that you are selecting the correct product before ordering.

Gloss Carbon Fiber Finish

The visible woven carbon fiber surface features a gloss finish that highlights the curvature of the outer sections, center fins and upper vent surround.

Because the diffuser uses model-specific mounting points and follows the factory rear bumper shape, test-fitting is recommended before final fastening. Professional installation is recommended for proper alignment and secure mounting.

Fitment Confirmation

If you are unsure about compatibility, send us your vehicle year, model, trim, body style and clear photos of the rear bumper and exhaust area before ordering so our team can help confirm fitment.

Explore more model-specific exterior upgrades in our 2017–2019 Audi A5 / S5 B9 carbon fiber parts collection.