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Asign Genuine Carbon Fiber Replacement Rear Diffuser / Rear Lip for Audi A4 / S4 Sedan (Multi-Gen Fitment | 2009-2024)

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Dramatically upgrade the rear aesthetics of your Audi A4 or S4 Sedan with this performance-oriented Genuine Carbon Fiber Replacement Rear Diffuser. Designed for a precise fit and aggressive visual impact, this diffuser transforms the look of your vehicle from stock to a bespoke, track-ready machine.

This is a full replacement component, engineered to clip directly into your factory bumper for a seamless, factory-grade aesthetic that enthusiasts demand.

Key Features & Highlights

  • True Carbon Fiber, Zero Performance Impact: Made from Genuine Carbon Fiber material, ensuring maximum lightweight properties. This upgrade provides stunning visuals without adding unnecessary weight, preserving your vehicle's factory performance dynamics.

  • Effortless 15-Minute DIY Installation: Designed as a Direct Replacement for the factory diffuser. The component is engineered for easy, straightforward installation, with most customers reporting a manual installation time of approximately 15 minutes (Installation guides/videos available upon request).

  • Non-Damaging & Seamless Fitment: The plug-and-play, replacement design means no drilling, cutting, or wiring is required. It securely snaps into the original mounting points, ensuring the integrity of your car's structure is fully preserved.

  • Broad Sedan Fitment: Tailored to fit multiple generations of the Audi A4 and S4 Sedan (including B8, B8.5, B9, and B9.5 chassis) from 2009 through 2024.

  • IMPORTANT FITMENT NOTE: This product is specifically for SEDAN models only. It is NOT compatible with Audi A4 Avant (Wagon) or Allroad models. Please verify your vehicle's body style before purchase.

Comprehensive Vehicle Fitment List

This product is confirmed to fit the following Audi A4/S4 Sedan models:

  • Audi A4 / S4 Sedan (All Generations): 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024.

  • Excludes: All Audi A4 Avant (Wagon) and Allroad Models.

Product Specifications

  • Product Name: Carbon Fiber Rear Diffuser / Rear Lip (Replacement Type)

  • Fitment: Audi A4 / S4 Sedan (B8, B8.5, B9, B9.5 Chassis)

  • Car Years: 2009-2024

  • Material: Genuine Carbon Fiber

  • Quantity: 1 Piece (Rear Diffuser)

  • Installation: Direct Replacement (Easy, Bolt-on)

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Asign Genuine Carbon Fiber Replacement Rear Diffuser / Rear Lip for Audi A4 / S4 Sedan (Multi-Gen Fitment | 2009-2024) Asign Genuine Carbon Fiber Replacement Rear Diffuser / Rear Lip for Audi A4 / S4 Sedan (Multi-Gen Fitment | 2009-2024) Asign Genuine Carbon Fiber Replacement Rear Diffuser / Rear Lip for Audi A4 / S4 Sedan (Multi-Gen Fitment | 2009-2024) Asign Genuine Carbon Fiber Replacement Rear Diffuser / Rear Lip for Audi A4 / S4 Sedan (Multi-Gen Fitment | 2009-2024) Asign Genuine Carbon Fiber Replacement Rear Diffuser / Rear Lip for Audi A4 / S4 Sedan (Multi-Gen Fitment | 2009-2024) Asign Genuine Carbon Fiber Replacement Rear Diffuser / Rear Lip for Audi A4 / S4 Sedan (Multi-Gen Fitment | 2009-2024)
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Frequently Asked Questions
What makes Asign different from other brands?
Asign stands out by offering meticulously designed carbon fiber kits that fit seamlessly with a variety of vehicle models. Our commitment to precision, use of high-quality materials, and focus on ease of installation set us apart in the market.
Why should I choose Asign's carbon fiber kits?

A1: Precision Design & Fit

Our design process strictly follows original vehicle specifications to ensure a perfect fit for your car. We approach each product with exceptional care and attention to detail.

A2: High-Quality Materials & Manufacturing
Asign uses the highest precision steel molds for production, reducing errors and maximizing accuracy. We employ pre-impregnated carbon fiber for all our products, making them genuine and lightweight, yet as strong as steel.

A3: Easy Installation & Non-Destructive Removal
Most of our carbon fiber kits can be installed in under 10 minutes (excluding special items like Front Splitters, Rear Diffusers, and Exhaust Tips). Designed for quick installation and removal without damaging your car's surface, our products offer both convenience and flexibility.

How does Asign ensure product quality?
Asign upholds strict quality control standards throughout the production process. We use premium materials and advanced manufacturing techniques, followed by comprehensive testing to ensure every product meets our high standards for performance and durability.
What if I have a quality issue with my product?
If you encounter any quality issues with your Asign product, please contact our customer service team right away. We will promptly address your concerns and offer solutions, including replacements or refunds, as appropriate.
How can I make sure the product I order fits my vehicle?
Before placing an order, carefully check your vehicle's specifications and refer to the product description for compatibility information. If you have any questions or concerns, our customer service team is always available to provide personalized advice and guidance.
What is Asign's return policy?
Our return policy varies depending on the specific product and the reason for the return. Please refer to our website or contact our customer service team for detailed information on our return and exchange procedures.