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Audi A4 B9 S-Line / S4 Rear Diffuser – Prepreg Dry Carbon Fiber (2020–2022 Sedan)

$969.99 USD$1,065.00 USD
Item is in stockHurry! Low inventoryItem is out of stock Item is unavailable

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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


Brand:K2 Industries
SKU:1600573580554
Manufacturer Part Number:1600573580554

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.

Our Florida Locations

Testimonials

We let our reviews speak for themselves.

4.9 average
914 reviews

Kissimmee

Orlando

Tampa

Great service at a fair price. I highly recommend them for all your performance needs. They have the know how to complete that project.

Donald Berry

Happy Customer

Google Review

Dropped off my 2022 Subaru WRX for Exhaust, spoiler, aeroflow dynamic kit, and they killed it. Quality work and amazing customer service. Speedzone gets you right.

Edward Roldan

Happy Customer

Google Review

They gave me the best price I could find after shopping around for a while. They are well informed and familiar with the products they sell, great communication and quick responses. I would no doubt purchase from them again. Solid company. Recommended. A+

Paul K

A Month Ago

Google Review

Came based on a work buddies recommendation. I was late by 30 minutes, confused my appointment time. But, 10/10 would come back. Came for a Downpipe and midpipe install. Not only was the gentleman accommodating, He ran into some issues, staff helped me out and pointed me into the right direction and got me going! They got my business and wouldn’t go anywhere else again!

Kiyo Gallimore

Verified Customer

Google Review

They Take Great Care Of Their Customers and Their Rates Are Better Than The Competition! They Also Respond Quickly And Have A Great Assortment Of Parts!

Jad

6 months Ago

Google Review

Absolutely love the customer service that you get with Speedzone Performance! All my questions are always answered in such a timely manner and this a big PLUS because I live out of Florida and for them to be on top of answering all my questions in such a way means a lot. Thank you all for the amazing customer service.

Daisy Vargas

Verified Customer

Google Review

My favorite place to go for anything car related, they have anything you could imagine & more. The people who work here are the coolest and most helpful people I’ve yet to meet at a car shop. They also don’t try to force sales on you and they genuinely help you with what you’re looking for, 100/10 shop!

Stephanie Trinidad

Loyal Customer

Google Review

The best of best, they are so nicely and kind people, yankee and billy more than the ones that runs the store they are a friend to everyone who walks in the store, very patient gets everyone what they need, everything you ask them they’ll answer your questions the best as possible, I love shopping there. They have the best prices, anything as car need you’ll find it there big shout-out to Yankee for being an amazing person and most important as a friend!! I love Speedzone!

Jansel Castillo

Loyal Customer

Google Review