2018–2023 Ford Mustang EcoBoost Rear Diffuser – Stealth Aero Diffuser for Dual Exhaust

Enhance the rear styling and aerodynamic performance of your 2018–2023 Ford Mustang EcoBoost with this Stealth Rear Diffuser designed for dual exhaust models. This diffuser adds a more aggressive performance appearance while helping manage airflow exiting from underneath the vehicle.

Unlike cosmetic-only diffusers, this design incorporates a functional aluminum belly pan that helps smooth airflow beneath the vehicle before directing it through the HDPE diffuser fins. The result is improved airflow management while maintaining a clean motorsport-inspired look.

The diffuser installs as an add-on to the factory rear valance, allowing Mustang owners to upgrade the rear aerodynamics without replacing the entire bumper. Available in one-piece or three-piece configurations, this diffuser provides flexibility depending on your installation preference.

Proudly manufactured in the United States, each unit is built to order using durable materials designed for long-term performance.

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Features

• Designed for 2018–2023 Ford Mustang EcoBoost
• Compatible with dual-tip exhaust systems
• Functional rear aerodynamic diffuser design
• HDPE diffuser panel and fins
• Integrated aluminum belly pan for airflow smoothing
• 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 EcoBoost

• EcoBoost Premium models

Requirements:

• Vehicle must have dual exhaust outlets (one tip 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 easy alignment of the diffuser fins

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Shipping & Lead Time

This product is built to order.

• 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 marks or surface scratches from the manufacturing process. This portion of the diffuser is not visible once installed on the vehicle.

Install Guide:

Main Diffuser:

Side Fins: