Porsche Boxster Cayman 981 GT4 Style Rear Diffuser 2012-2016

Enhance the rear styling and aerodynamic performance of your 2012-2016 Porsche Boxster or Cayman 981 with this GT4 Style rear diffuser. Inspired by the aggressive factory GT4 design, this upgrade delivers a more performance-focused rear profile while maintaining clean OEM-style integration.

This rear diffuser is precision engineered for the 981 platform, ensuring seamless fitment with the factory rear bumper. The GT4 Style design features pronounced fins and sculpted contours that improve airflow and add a more aggressive visual presence to the rear end.

Available in FRP, CFRP, and FGCF material options, this diffuser offers flexibility for both paint-ready customization and premium carbon fiber finishes. Built for durability and high-quality fitment, this upgrade is ideal for daily driving, show builds, and performance styling enhancements.

Product Specifications

Key Features

• Designed for 2012-2016 Porsche Boxster and Cayman 981 models
• GT4 Style rear diffuser for aggressive and track-inspired styling
• Enhances rear aerodynamics and airflow efficiency
• Improves rear-end visual depth and performance appearance
• Precision engineered for OEM-style fitment
• Available in FRP, CFRP, and FGCF material options
• Lightweight and durable construction
• Seamless integration with factory rear bumper
• Suitable for street, show, and performance builds
• Designed for direct replacement installation

Configuration Options

• FRP – Paint-ready option for custom color matching
• CFRP – Gloss carbon fiber finish for lightweight performance and premium appearance
• FGCF – Forged carbon fiber style for a unique textured finish

Package Includes

• Rear diffuser

Note: Professional installation is recommended to ensure proper alignment and secure fitment.

Installation

• Direct replacement or bolt-on installation
• Designed to fit factory rear bumper mounting points
• No major modification required
• Test fitting recommended before final installation
• Professional installation recommended

Fitment

• 2012-2016 Porsche Boxster 981
• 2012-2016 Porsche Cayman 981

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.