Audi A4 B9 Avant (2017-2019) Carbon Fiber Diffuser – Performance Diffuser Extension

The Audi A4 B9 Avant blends performance and practicality — but the rear end deserves the same aggressive attention as the front. This carbon fiber rear diffuser extension is designed to enhance the lower bumper profile, adding sharper definition and a more performance-inspired finish to your Avant build.

Precision engineered using advanced molding techniques, this rear lip follows the factory bumper lines for a clean OEM+ appearance while giving the car a lower, wider visual stance. The gloss carbon finish contrasts perfectly against factory paint and ties in seamlessly with other aero upgrades.

Fitment:

• Audi A4 B9 Avant (8W5)
• Fits factory rear bumper

Features:

• High-quality carbon fiber construction
• Gloss carbon black finish
• Precision designed for accurate bumper fitment
• Enhances rear-end depth and aggressiveness
• Lightweight yet structurally durable
• High-polish surface with protective clear coat

Content:

• 1x Carbon Fiber Rear Diffuser Extension
• Installation hardware (adhesive tape and/or screws)

Specifications:

• Material: Carbon Fiber
• Position: Rear Bumper
• Approximate Dimensions: 143cm x 36cm x 20cm
• Condition: Brand New
• Warranty: 1 Year

Shipping Information:

• Processing Time: 2-5 business days for warehouse stock items
• Made-to-Order: Please allow 2-4 weeks for shipping if product requires custom manufacturing

Designed specifically for the B9 Avant platform, this rear lip upgrade gives your wagon a more aggressive lower edge without compromising the factory body lines. Pair it with a front lip and side skirt extensions for a complete, cohesive aero package.

Refine the rear profile. Complete the build. Elevate your A4 Avant with K2 Industries.