2017 Audi A3 / S3 8V.5 Rear Diffuser Lip

Upgrade the rear-end appearance of your selected 2017 Audi A3, A3 Quattro or S3 8V.5 model with this rear bumper diffuser lip. Designed for the lower rear valance area, this diffuser helps create a cleaner, sharper and more performance-inspired rear profile while keeping the exterior styling subtle and street-ready.

This product is available in carbon fiber and gloss black FRP options. The carbon fiber version features a gloss 3K-style carbon fiber finish, while the FRP version offers a cost-effective gloss black alternative for customers who want a similar rear styling upgrade at a lower price point.

Fitment

Material Options

• Carbon Fiber: Gloss carbon fiber finish for customers looking for a premium rear diffuser appearance.
• Gloss Black FRP: A more cost-effective option with a clean gloss black exterior look.
• Carbon Fiber Small Flaw: Discounted carbon fiber option with minor cosmetic imperfections where available.

Key Features

• Designed for selected 2017 Audi A3 / A3 Quattro / S3 8V.5 rear bumper applications
• Rear diffuser lip design for a sharper lower rear bumper appearance
• Available in carbon fiber or gloss black FRP material options
• Replacement-style rear lower valance upgrade
• Quality checked before shipment
• Professional installation is recommended

Installation Notes

This rear diffuser lip is designed as a replacement-style exterior upgrade for the rear lower bumper area. Installation may require screws, clips or adhesive depending on the vehicle bumper structure and selected material version. Please test fit the product before final installation. Professional installation is recommended.

Shipping & After-Sales Support

• US and EU warehouse support for selected in-stock items
• 30-day return policy for unused items in original condition
• Damaged on arrival? Contact us within 72 hours for support
• Fitment confirmation and installation guidance available before ordering
• 1-year factory warranty and global after-sales support

Before Ordering

This product is designed for selected 2017 Audi A3, A3 Quattro and S3 8V.5 models. Rear bumper shapes may vary by trim, market and body style. If you are unsure whether this rear diffuser fits your vehicle, please send us your vehicle year, trim and rear bumper photos through our contact us page before placing an order.

Explore More Audi A3 / S3 Carbon Fiber Upgrades

Looking for more upgrades for the same platform? Browse our 2017–2020 Audi A3/S3 8V.5 carbon fiber parts collection for related front lips, rear diffusers, spoilers and exterior upgrades.

You can also explore our Audi A3/S3 carbon fiber parts collection, or view all Audi carbon fiber parts available from AHACARBON.

FAQ

Does this rear diffuser fit 2018–2020 Audi A3 or S3 models?

This product is currently confirmed for selected 2017 Audi A3, A3 Quattro and S3 8V.5 models. For 2018–2020 vehicles, please contact us with rear bumper photos before ordering.

Is this a full rear bumper?

No. This product is a rear bumper diffuser lip / rear lower valance upgrade. It is not a complete rear bumper replacement.

What is the difference between carbon fiber and gloss black FRP?

The carbon fiber option provides a premium gloss carbon fiber appearance, while the gloss black FRP option offers a more affordable black finish with a similar exterior styling effect.

Is professional installation recommended?

Yes. Test fitting before final installation is recommended, and professional installation is strongly advised for the best fitment and finish.

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