2018–2023 Ford Mustang GT Stealth Rear Diffuser – Quad Exhaust Performance Diffuser

Enhance the rear styling and aerodynamic performance of your 2018–2023 Ford Mustang GT with this Stealth Rear Diffuser designed for quad-tip exhaust models. Engineered to complement the factory rear valance, this diffuser adds a more aggressive motorsport appearance while helping manage airflow exiting from underneath the vehicle.

The design incorporates a functional aluminum belly pan that smooths airflow coming from the differential area before directing it through the HDPE diffuser fins. This setup helps improve airflow management while maintaining a clean OEM-inspired finish.

Built using durable HDPE materials with an automotive-grade finish, this diffuser is designed to install as an add-on to the factory rear valance, allowing Mustang owners to upgrade their rear aero styling without replacing the entire bumper assembly.

Each diffuser is built to order in the United States and is available in one-piece or three-piece configurations depending on your preferred installation setup.

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Features

• Designed for 2018–2023 Ford Mustang GT
• Compatible with quad-tip exhaust systems
• Functional rear aerodynamic diffuser design
• Integrated aluminum belly pan for improved airflow management
• HDPE diffuser panel and fins
• Installs as an add-on to the factory rear valance
• Available in one-piece or three-piece configuration
• Made in the USA

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Product Finish Options

Standard Aluminum

• HDPE diffuser panel and fins
• Raw aluminum mounting plate

Black Powder-Coated Aluminum

• HDPE diffuser panel and fins
• Black powder-coated aluminum mounting plate

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Vehicle Fitment

Compatible with:

• 2018-2023 Ford Mustang GT
• Mustang GT Premium
• Mustang GT Performance Pack Level 1 (PP1)
• Mustang GT Performance Pack Level 2 (PP2)

Requirements:

• Vehicle must have quad exhaust tips (two per side)
• Factory rear valance required for proper mounting

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Installation

The diffuser installs directly to the factory rear valance.

Installation notes:

• Diffuser fins ship separate from the main panel to reduce shipping size
• Assembly requires a Phillips screwdriver or drill
• Pre-drilled holes allow the fins to align easily with the main panel

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Shipping & Lead Time

This product is built to order.

Typical production lead times:

• Standard aluminum version: approximately 5–7 business days before shipment
• Black powder-coated version: approximately 7–10 business days before shipment

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Note

The aluminum mounting plate is a structural component and may show minor surface marks from manufacturing. This section is not visible once the diffuser is installed on the vehicle.

Install Guide:

Main Diffuser:

Side Fins: