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CMST Carbon Fiber Rear Diffuser for Audi S3 and A3 (8Y, 2021–Present)

Price range: $92.44 through $92.71

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CMST Carbon Fiber Rear Diffuser for Audi S3 / A3 8Y (2021-ON)

Elevate the rear-end aesthetics and aerodynamic profile of your Audi with the CMST Carbon Fiber Rear Diffuser. Designed specifically for the Audi A3, A3 S Line, and S3 models from the 8Y generation (2021 onwards), this precision-engineered diffuser adds an aggressive, race-inspired look while helping to manage airflow for enhanced stability. Crafted by CMST, a leader in premium automotive aero components, this diffuser is the definitive upgrade for drivers seeking a perfect blend of high-performance style and quality.

Constructed from authentic, high-grade carbon fiber, this diffuser features a meticulously laid weave that is protected by a durable UV-resistant clear coat. This premium finish ensures the striking visual depth of the carbon fiber is preserved, preventing yellowing or fading from sun exposure and maintaining its glossy, show-quality appearance for years to come. The result is a part that is not only visually stunning but also built to withstand the demands of daily driving.

  • Precision Fitment: Engineered exclusively for the Audi A3, A3 S Line, and S3 (8Y chassis) from model year 2021 onward.
  • Premium Material: Manufactured from real, high-quality carbon fiber for a lightweight and strong construction.
  • Show-Quality Finish: Finished with a protective UV-resistant clear coat to guard against fading and ensure a lasting glossy appearance.
  • Direct Replacement: Designed as a direct-fit component for straightforward installation, replacing the factory rear valance.

All CMST parts are supplied and backed by AME Motorsport, guaranteeing you receive a premium quality product with full support.

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Pattern & Finish

Woven Carbon Fiber with Gloss Finish, Woven Carbon Fiber with Matte Finish, Forged Carbon Fiber with Gloss Finish, Honey Comb Carbon Fiber with Gloss Finish

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