• Audi S4 B9.5 Carbon Fiber Rear Diffuser - Installed View 1
  • Audi S4 B9.5 Carbon Fiber KB Style Rear Diffuser with LED - Main
  • Audi S4 B9.5 Carbon Fiber Rear Diffuser - Installed View 2
  • Audi S4 B9.5 Carbon Fiber Rear Diffuser - Close-up
  • Audi S4 B9.5 Carbon Fiber Rear Diffuser - Angle View
  • Audi S4 B9.5 Carbon Fiber Rear Diffuser - LED Detail
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2020-2025 Audi S4 B9.5 Carbon Fiber KB Style Rear Diffuser with LED Brake Light

$779.99
$779.99
Sale Sold out
Shipping calculated at checkout.

Enhance the rear-end styling of your 2020-2025 Audi S4 B9.5 with this KB Style Carbon Fiber Rear Diffuser - complete with an integrated vertical LED brake light for a motorsport-inspired presence and added visibility.

Key Technical Advantages:

  • Genuine 2x2 Carbon Fiber Construction - Premium twill-weave carbon fiber delivers exceptional strength-to-weight ratio with a distinctive high-end weave pattern visible under the gloss finish.
  • Integrated Vertical LED Brake Light - Distinctive center-mounted LED brake light adds a modern, track-inspired visual signature while improving rear visibility.
  • B9.5-Exclusive Fitment (2020-2025) - Engineered specifically for Audi S4 B9.5 models. Follows factory rear bumper contours for a precise, seamless OEM-style installation.
  • High-Gloss UV-Protected Clear Coat - Multi-layer UV-resistant clear coat prevents yellowing and fading, preserving the deep carbon fiber luster through years of exposure.
  • Bolt-On Installation with 3M Tape - Includes all necessary mounting hardware. Professional installation recommended for optimal fitment and LED wiring.

Compatibility:

  • 2020-2025 Audi S4 B9.5 (all S4 variants)
  • Does NOT fit Audi A4 (Non S-Line or S-Line models)

Technical Specifications:

Material Genuine Carbon Fiber (2x2 Twill Weave)
Finish Gloss UV-Protectant Clear Coat
Style KB Style with Integrated LED Brake Light
Chassis B9.5 (2020-2025)
Installation Bolt-On
Package Includes Carbon Fiber Rear Diffuser, Integrated LED Brake Light, Mounting Hardware

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  • Shipping & Delivery
  • Refund & Return
  • FAQ

US orders

Delivery range: 48 states (excluding Alaska, Hawaii, Puerto Rico, military addresses, etc.) and Canada, etc.

Delivery method: FedEx/UPS/DHL free delivery, no PO boxes.

Time limit: depends on the region.

Free shipping within the continental US !

International orders

Cost: Shipping + tariffs are calculated separately, please contact customer service for confirmation（The transportation time is subject to the shipping standards of the Chinese warehouse）.

Logistics: FedEx/UPS/POST/DHL, etc.

Standard products

Shipment from US warehouse: shipped on the second working day after order confirmation, and delivered in 2-5 working days.

Shipment from China warehouse: shipped 2-5 working days after order confirmation, and expected to be delivered in 7-10 working days.

International orders: The time limit refers to the China warehouse standard, and the specific details need to be confirmed with customer service.

Special products

Large items (such as rims): only support sea transportation, and the transportation cycle is about 25-45 days.

Customized carbon fiber products:

Production cycle: need to be confirmed after purchase.

Transportation method: choose air transportation (total cycle 10-15 days) or sea transportation (total cycle 25-35 days) according to size.

Cancellation Policy

  • Orders can be canceled free of charge within 24 hours of placement. Refunds will be processed to the original payment method within 3-5 business days.

 

Return Policy

Timeframe

  • 14-Day Returns: Returns are accepted within 14 days of delivery. No returns/exchanges permitted after this period.
  • Customized Products: Non-returnable.

Eligibility

  • Items must be unused, undamaged, and in their original packaging with all accessories.
  • A valid proof of purchase (receipt/order confirmation) is required.
  • Returns must use the official return label provided by us.

Process

  1. Contact customer service at support@elitegermanparts.com to request a return label.
  2. Sign the inspection form upon return delivery.
  3. Report damages within 24 hours of signing. After this period, the product is assumed to be in good condition.

Cost Responsibilities

  • Customers cover round-trip shipping costs for non-defective returns.
  • Non-U.S. Customers: Must pay international shipping fees to return items to China (may be expensive).

Q1: Why do the products displayed in the store not include complete accessories?
A: The products displayed in our store do not include complete accessories. When you purchase the product, we will give you the required accessories. The accessories may be mailed with the product in 1 or 2 packages. We will provide you with the corresponding package tracking number so that you can check the logistics information in real time.

Q2: The package received is damaged, but it does not affect the installation and appearance. What should I do?
A: If the package is damaged but does not affect the installation and appearance of the product, in order to reduce your after-sales time, we will apply for part of the compensation for you. You do not need to send back the damaged package, just keep the package and the product. We will have a dedicated after-sales staff to communicate with you about compensation matters to ensure that your rights and interests are protected.


Q3: What should I do if the package is damaged and affects the installation of the product?
A: If the package is damaged and affects the installation of the product, you can rest assured that we will re-mail you a new product free of charge. Please provide photos of the damage within 24 hours after receiving the package. The photos must include the outer packaging of the package with the tracking number so that we can accurately verify the situation. We will assist you in applying for compensation from the courier and handle related matters for you throughout the process. You only need to wait patiently for the delivery of the new package.


Q4: Is the product guaranteed to be compatible?
A: All products have passed market verification and we guarantee the adaptability of the products. During the design and production process, we have undergone rigorous testing and verification of actual scenarios.


Q5: What should I do if there is incompatibility during installation?
A: If there is incompatibility during the installation process, please contact our customer service team in time. We have rich installation experience and will provide you with detailed solutions and technical support based on the specific problems you encounter to help you solve the problems in the installation process and enable the product to be installed and used smoothly.


If you have other questions or questions during the shopping process, please feel free to contact us by email at support@elitegermanparts.com, we will serve you wholeheartedly!