Audi A4 B9 Avant Rear Diffuser Extension – Carbon Fiber

Sharpen the rear end of your Audi A4 B9 Avant with this carbon fiber rear diffuser extension. Molded to follow the factory bumper lines, it adds lower-end definition for a lower, wider visual stance and a more performance-inspired finish.

Build

• Material: Genuine carbon fiber, lightweight and structurally durable, with an authentic weave appearance over carbon-look alternatives
• Manufacturing: Precision-moulded for accurate bumper fitment
• Surface finish: High-polish gloss carbon black finish with a protective clear coat
• Configuration: Single-piece diffuser extension for the lower rear bumper

Design & Aerodynamics

• Aggressive stance: Diffuser extension adds depth to the lower rear for a lower, wider, more planted stance
• Carbon aesthetic: Gloss carbon black weave and high-polish finish create strong contrast against the factory paint
• Factory-style integration: Precision-molded to the contours of the factory rear bumper for a clean, seamless fit

Fitment

• Audi A4 B9 Avant (8W5)
• Fits the factory rear bumper only — not compatible with aftermarket bumper configurations
• Body style: Avant (wagon) only
• Confirm your model and trim against the product images before ordering

Package Contents

• 1 × carbon fiber rear diffuser extension
• Installation hardware (adhesive tape and/or mounting screws)

Installation

• Two mounting options: Fits using the supplied adhesive tape and/or mounting screws for a secure fit
• Drilling may be required: If you use the screw option, screw fixing pierces the bumper, so it is a permanent modification rather than a reversible fit
• Surface prep: If using adhesive tape, thoroughly clean, degrease, and dry the rear bumper before fitting to ensure maximum adhesion
• Alignment: Dry-fit and check the diffuser sits centred and even across the bumper before committing to either method
• Professional installation recommended for correct positioning, panel alignment, and a clean finish

Before You Install

• Confirm your car is an A4 B9 Avant before ordering — this is moulded for the Avant rear bumper
• Take care when parking rear-in — lower rear panels sit close to kerbs and parking blocks
• Adhesive installation is reversible, but removal and re-prep may be required if the diffuser needs repositioning