Audi A4 B9 Avant Rear Diffuser Extension – Carbon Fiber
SHIPPING - RETURNS - WARRANTY - CANCELLATION POLICY
*** Market Conditions after 2020 have changed the landscape of automotive parts. Although we try to stock 1000's of items in our multiple warehouse and use multiple distribution channels, having back-orders are unavoidable in today's market. If you are in need of a product quickly, we suggest email, message, or call us for availability so that we may explore your options.
Email: Sales@Speedzoneweb.com
Call: 407-846-8430
Text: 407-749-6314
Frequently Asked Questions
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
Our History
For 26 years Speedzone Performance LLC has been providing aftermarket car parts to Central Floridians and 1000's of customers online. What makes us different than all the other places online? We have 3 actual brick and mortar locations where were serve customers daily and find new ways to provide support and assistance to the automotive community at large. From our in house SPDZ1 Brand, to our constantly growing in stock inventory, we strive to make our customer service and ease of purchase stand out from the rest! We are also one of the largest automotive part financing providers anywhere in the United States, and continue to provide more options for our customers every year. We love what we do, and it shows in every product we sell and every new customer who becomes a part of our Speedzone Family.