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
