Audi A4 B9 S-Line / S4 Rear Diffuser – Prepreg Dry Carbon Fiber (2020–2022 Sedan)
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
The rear end of your B9 deserves the same attention as the front. This Prepreg Dry Carbon Fiber Rear Diffuser for the Audi A4 S-Line and S4 Sedan delivers aggressive styling with precision fitment, giving your build that refined performance look without going over the top. Designed to enhance the factory rear bumper lines, this diffuser adds depth, sharp edges, and true motorsport-inspired presence.
Constructed using advanced prepreg dry carbon and autoclave curing, this piece offers superior strength while keeping weight to a minimum. The 3K twill weave is finished in a deep high-gloss clear coat that highlights the carbon pattern and provides long-lasting surface protection. Whether you're going OEM+ or building a full aero setup, this diffuser completes the rear profile with purpose and style.
Features:
- Prepreg dry carbon fiber construction
- Autoclave cured for maximum durability and lightweight performance
- 3K twill weave carbon finish
- High-gloss UV-protected clear coat
- Precision 3D molded design
- Enhances rear bumper aerodynamics and styling
- Direct fit installation using supplied hardware
Content:
- 1x Rear diffuser lip
- Mounting screws included
Fitment:
- 2020-2022 Audi A4 B9 S-Line Sedan
- 2020-2022 Audi S4 B9 Sedan
Specifications:
- Material: Prepreg Dry Carbon Fiber
- Weave: 3K Twill
- Finish: High-Gloss Black Clear Coat
- Position: Rear Bumper
- Installation: Screw-on
- 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
If you're serious about your B9 build, carbon details like this make all the difference. Clean, aggressive, and built to elevate your Audi’s rear profile — this is the upgrade that pulls everything together.
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.