2012 - 2016 Porsche 981 Boxster/Cayman GT4 Style Carbon Fiber Rear Diffuser

Upgrade the rear-end profile of your Porsche Boxster or Cayman 981 with this GT4 Style Carbon Fiber Rear Diffuser. Designed to add a sharper and more race-ready appearance, this rear diffuser enhances the lower rear bumper area while complementing the factory body lines of the 981 platform.

The GT4 Style rear diffuser design improves aerodynamic presence and rear-end visual impact with a more aggressive, performance-inspired profile. Its diffuser-style shape helps create a more planted look, making it an ideal upgrade for street, track, or show-focused Porsche builds.

Made from premium FRP, CFRP, FGCF, and DryCF material options, this carbon fiber rear diffuser offers durable construction, lightweight styling appeal, and multiple finish choices. Designed for 2012-2016 Porsche 981 Boxster and Cayman models, each package includes one carbon fiber rear diffuser.

Product Specifications

Key Features

• GT4 Style carbon fiber rear diffuser designed for the Porsche Boxster and Cayman 981
• Designed for 2012-2016 Porsche 981 Boxster and Cayman models
• Adds a sharper, sportier, and more race-ready rear-end appearance
• Enhances the lower rear bumper area with premium carbon fiber styling
• Designed to improve airflow appearance and aerodynamic presence
• Available in FRP, CFRP, FGCF, and DryCF material options
• Lightweight construction options with durable exterior appeal
• Complements the factory body lines of the 981 platform
• Ideal for street, track, or show-focused Porsche exterior builds
• Includes one carbon fiber rear diffuser

Configuration Options

• Material Option: Available in FRP, CFRP, FGCF, and DryCF material options
• Rear Diffuser Setup: Designed to enhance the Porsche 981 Boxster and Cayman lower rear bumper area
• GT4 Styling: Adds a race-inspired rear profile with aggressive exterior character
• Aerodynamic Styling: Enhances rear airflow appearance and creates a more planted performance look
• Exterior Finish: Multiple material options allow for FRP, carbon fiber, forged carbon fiber, or dry carbon fiber styling

Package Includes

• One carbon fiber rear diffuser

Note: Professional installation is recommended for best alignment and secure fitment. Test fitting is recommended before final installation. Minor adjustment may be required depending on the vehicle and selected material option.

Installation

• Designed for installation on the lower rear bumper and rear diffuser area
• Professional installation is recommended for proper alignment and secure mounting
• Test fitting is recommended before final installation
• Some adjustment may be required during installation for best results
• Proper diffuser alignment, mounting points, exhaust clearance, and rear bumper fitment should be checked during installation

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.