GT4 Style Carbon Fiber Rear Diffuser - Porsche 718 Cayman / Boxster 2017-2024

Transform the rear-end appearance of your Porsche 718 Cayman or Boxster with this GT4 Style Carbon Fiber Rear Diffuser. Inspired by the aggressive aerodynamic design of the 718 Cayman GT4, this rear diffuser gives standard 718 models a sharper, lower, and more motorsport-focused appearance while complementing the factory rear bumper design.

Constructed from high-quality carbon fiber, the diffuser combines lightweight construction with excellent rigidity and a premium exposed-carbon finish. Its pronounced vertical fins, sculpted outer sections, and center exhaust opening create a distinctive GT-inspired rear profile while integrating cleanly with the Porsche 718 body lines.

Key Specs

Package Includes

• 1 × GT4 Style Carbon Fiber Rear Diffuser Assembly
• Integrated Vertical Diffuser Fins
• Center Exhaust Opening
• Left & Right Lower Rear Extensions, where supplied as separate pieces
• Mounting Hardware, where supplied

Features

• GT4-Inspired Styling: Designed to give the Porsche 718 Cayman and Boxster a more aggressive rear profile inspired by the track-focused Cayman GT4.
• Premium Carbon Fiber Construction: Lightweight carbon fiber provides excellent rigidity while adding a high-end motorsport appearance.
• Aggressive Diffuser Fins: Integrated vertical fins create a more pronounced lower rear profile and reinforce the performance-oriented styling.
• Center Exhaust Integration: Designed around the center exhaust configuration shown, maintaining a clean and cohesive rear bumper appearance.
• Aerodynamic Styling: The sculpted diffuser profile is designed to complement airflow beneath the rear of the vehicle while enhancing its track-inspired character.
• Lightweight Upgrade: Carbon fiber construction helps minimize additional weight compared with heavier conventional composite components.
• Gloss Carbon Fiber Finish: Exposed carbon weave provides a premium appearance that pairs well with other carbon fiber exterior components.
• UV-Resistant Clear Coat: Protective clear coating helps reduce fading, yellowing, and deterioration caused by sunlight and environmental exposure.
• Vehicle-Specific Design: Shaped around the Porsche 718 Cayman and Boxster rear bumper for clean integration and an OEM-inspired fit.
• Motorsport-Inspired Rear Profile: Creates a wider, lower, and more aggressive stance that complements rear wings, spoilers, side skirts, and other aerodynamic upgrades.

Vehicle Fitment

• Porsche 718 Cayman - 2017-2024
• Porsche 718 Boxster - 2017-2024

Fitment Note: Please verify your exact model year, rear bumper configuration, exhaust layout, parking sensor locations, and factory diffuser design before ordering. Fitment may vary between Cayman, Cayman S, Cayman GTS, Boxster, Boxster S, and Boxster GTS configurations.

This product is a GT4-style aerodynamic upgrade for compatible Porsche 718 Cayman and Boxster models. Compatibility with genuine Cayman GT4, GT4 RS, or Spyder bumpers should be confirmed separately before purchase.

Installation

Professional installation by an experienced Porsche or performance body shop is recommended. The rear diffuser should be fully test-fitted before final installation to verify bumper alignment, center exhaust clearance, mounting locations, and surrounding body-panel gaps.

Installation requirements may vary depending on the exact Porsche 718 trim and factory rear bumper configuration. Minor adjustment or additional mounting hardware may be required for certain applications.

Care Guide

Regular Cleaning: Clean the carbon fiber diffuser regularly using a soft microfiber cloth with mild soap and water. Avoid abrasive cleaners or harsh chemicals that could damage the protective clear coat.

Use Microfiber Pads and Cloths: Use clean microfiber materials when washing, drying, polishing, or applying protective coatings to minimize surface scratches.

Protect From Sun and Chemicals: Avoid prolonged exposure to harsh chemicals and excessive sunlight whenever possible to preserve the carbon fiber weave and clear-coat finish.

• Carbon Fiber Construction
• GT4 Style Rear Diffuser
• Integrated Vertical Diffuser Fins
• Center Exhaust Opening
• Lightweight Construction
• Gloss Carbon Fiber Finish
• UV-Resistant Clear Coat
• Aggressive Motorsport Styling
• Rear Lower Bumper Installation
• Porsche 718 Specific Design