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Asign Carbon Fiber Rear Diffuser For B9.5 2020-2024 Audi A4/S4

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Asign Carbon Fiber rear diffuser For 2020-2024 B9.5 Audi A4/S4 Asign Carbon Fiber Rear Diffuser For B9.5 2020-2024 Audi A4/S4 Asign Carbon Fiber Rear Diffuser For B9.5 2020-2024 Audi A4/S4 Asign Carbon Fiber rear diffuser For 2020-2024 B9.5 Audi A4/S4 Asign Carbon Fiber Rear Diffuser For B9.5 2020-2024 Audi A4/S4 Asign Carbon Fiber Rear Diffuser For B9.5 2020-2024 Audi A4/S4 Asign Carbon Fiber Rear Diffuser For B9.5 2020-2024 Audi A4/S4

Product Information

Product Description

Give your Audi A4 a more aggressive and aerodynamic rear profile. This carbon fiber rear diffuser is precision-engineered for B9.5 A4/S4 models (2020–2024), made from Glossy or Matte 3K carbon fiber and weighs just 3kg. Designed to retain original screw points and pre-installed with 3M tape, installation is clean and drill-free. For a fully upgraded look, we recommend pairing it with aftermarket exhaust tips to match the diffuser contours.

Product Features
  • OEM-Fit Integrated Design: Contoured specifically for B9.5 A4/S4 rear bumpers—perfect edge-to-edge alignment.
  • Lightweight Dry Carbon Build: Weighs only 3kg and built to last with high-rigidity carbon fiber.
  • Visual & Aerodynamic Upgrade: Elongates the rear profile for a more planted and track-ready look.
  • Exhaust Tip Friendly: Best paired with aftermarket exhaust tips for seamless visual flow.
  • Quick DIY Installation: Uses OEM screw locations and pre-applied 3M tape—no cutting or special tools needed.

 

Questions? Email us at service@asigncar.com

Compatibility & Package

This carbon fiber rear diffuser is exclusively designed for the following Audi models:

Make Model Chassis Year Range
Audi A4 / S4 B9.5 2020–2024

⚠️ Note: Not compatible with B9 (2016–2019) or non-Sedan models.

What's in the Box

  • 1× Carbon Fiber Rear Diffuser
  • 1× Pre-applied 3M Automotive Adhesive Tape

    • Installation Guide

  • Test Fit: Position the diffuser under the rear bumper to check alignment and symmetry.
  • Remove OEM Screws: Use a screwdriver to remove original screws where diffuser mounts.
  • Clean the Area: Thoroughly clean the installation surface with a dry cloth.
  • Apply Adhesion Promoter: (Optional) Apply evenly on areas where tape will stick.
  • Peel & Stick: Peel off a section of the 3M backing, align carefully, and press into place.
  • Reinstall Screws: Tighten original screws to reinforce the diffuser in place.

    • Pro Tip: Avoid car washes or rain exposure for 72 hours post-installation to ensure proper bonding.

    Notes & FAQ

  • Q1: Do I need to drill into my bumper?
    A: No drilling is required. The diffuser uses existing OEM screw holes and strong adhesive backing.
  • Q2: Does it fit all A4/S4 models?
    A: This diffuser is designed only for the B9.5 generation (2020–2024). It will not fit earlier models.
  • Q3: Should I upgrade my exhaust tips?
    A: Yes. We recommend aftermarket exhaust tips for the best visual fit and performance styling match with the diffuser.
  • Q4: Can I install this myself?
    A: Absolutely. With basic tools, most users can complete installation in under 30 minutes.

    Where Technology Meets Precision

    Precision Mold Engineering

    Steel molds ensure precision, while premium carbon fiber offers strength, rigidity, and lightweight efficiency for unmatched durability and style.

     
    Autoclave Carbon Curing

    Each carbon fiber part is autoclave-cured under high pressure and temperature, ensuring a flawless weave and exceptional strength for lasting performance and appearance.

    OEM-Quality Fitment

    Designed to fit your vehicle’s contours precisely, each part ensures OEM quality for seamless integration and a high-performance, stylish upgrade.

    Precision Mold Engineering

    Steel molds ensure precision, while premium carbon fiber offers strength, rigidity, and lightweight efficiency for unmatched durability and style.

     
    Autoclave Carbon Curing

    Each carbon fiber part is autoclave-cured under high pressure and temperature, ensuring a flawless weave and exceptional strength for lasting performance and appearance.

    OEM-Quality Fitment

    Designed to fit your vehicle’s contours precisely, each part ensures OEM quality for seamless integration and a high-performance, stylish upgrade.

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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.