Audi B9 A4 S4 MD Style Carbon Fiber Trunk Spoiler 2017-2018

Enhance the rear styling and aerodynamic profile of your 2017-2018 Audi B9 A4 Sport or S4 with this MD Style carbon fiber trunk spoiler. Designed to provide a refined yet sporty appearance, this spoiler adds subtle elevation to the trunk line while maintaining a clean OEM+ aesthetic.

Precision-engineered for the Audi B9 platform, this trunk spoiler follows the factory trunk contours for a seamless and integrated fit. The MD styling enhances rear-end definition and gives the vehicle a more dynamic and performance-oriented presence without compromising its original design.

Constructed from high-quality carbon fiber, this trunk spoiler offers lightweight performance, durability, and a premium finish. Available in multiple carbon fiber options, it is ideal for daily drivers, performance builds, and show-quality vehicles seeking a subtle yet impactful exterior upgrade.

Product Specifications

Key Features

• Designed for 2017-2018 Audi B9 A4 Sport and S4 models
• MD Style trunk spoiler for enhanced rear styling
• Carbon fiber construction for lightweight durability and strength
• Available in CFRP and forged carbon fiber finishes
• Precision fitment following factory trunk contours
• Enhances rear aerodynamics and overall vehicle profile
• Improves rear-end definition and sporty appearance
• Maintains OEM+ fit and clean body line integration
• No drilling required installation
• Suitable for daily driving, performance builds, and show vehicles

Configuration Options

• CFRP – Traditional carbon fiber weave with a glossy finish
• Forged Carbon Fiber (FGCF) – Distinct marbled carbon pattern for a modern performance look

Package Includes

• Trunk spoiler

Note: Products marked as PRE-ORDER require production prior to shipping. Air shipping ETA is approximately 5–6 weeks, while container shipping ETA is approximately 3–4 months. Delivery times may vary depending on production schedules.

Installation

• Double-sided tape installation
• Automotive-grade adhesive recommended
• No drilling required
• No permanent modification required
• Professional installation recommended

Fitment

• 2017-2018 Audi A4 B9 Sport
• 2017-2018 Audi S4 B9

United States: Free shipping available to the lower 48 states across all items. Other states will incur a shipping charge.

Worldwide: Free shipping is available for Complete Headlights, Taillights, DRLs. For custom headlight retrofits, carbon fiber products, and performance products, there will be a shipping charge.  

Please note:
• For Retrofits, you are purchasing a headlight modification service.
• If you select "Shipping own headlights to BayOptiks for modification", you are required to send us your headlights.
• If you choose "Purchase new OEM headlights", we will order and modify a new OEM headlight for you.
• Once your customizations are complete, we will ship it to you!

• Complete Headlights: 3-5 business days for order processing plus shipping time.
• Custom & Pre-Built Headlights: 6-8 weeks depending on the complexity and component availability.
• New OEM and cores: 6-8 weeks plus an additional 4-8 weeks as these are special orders base on the vehicle VIN due to different versions (North American, European, etc.)
• DRLs, Taillights, Brake Pads, and Carbon Fiber Aero: 3-5 business days for order processing, plus shipping time.
• Lens Replacements: 1-3 weeks plus shipping time.

Please note, we do not have control over the time frames of our vendors, manufacturers, and delivery services as they may delay processes in regards to components and shipment.