2018–2023 Ford Mustang EcoBoost Black Rear Diffuser & Splitters

Transform the rear-end appearance of your Ford Mustang EcoBoost with the Black Rear Diffuser & Rear Side Splitter Kit. Designed to enhance the aggressive styling of the S550 Mustang, this exterior upgrade adds a bold, performance-inspired look that complements your vehicle’s muscular body lines.

Featuring a sleek black finish and an aggressive diffuser design, this kit enhances the lower rear bumper with distinctive styling details. The matching rear side splitters complete the look, creating a more cohesive, sporty appearance that’s perfect for Mustang enthusiasts looking to stand out.

Whether you’re upgrading your daily driver or completing a custom exterior build, this rear diffuser kit delivers a striking finishing touch to your Mustang.

Features

• Aggressive Rear Diffuser Design: Enhances the lower rear bumper with bold, performance-inspired styling.
• Sleek Black Finish: Creates a clean, sporty appearance that complements a wide range of exterior colors.
• Matching Rear Side Splitters: Adds distinctive styling accents to both sides of the rear bumper.
• Sport-Inspired Appearance: Creates a more pronounced, aggressive rear-end profile.
• S550 Exterior Styling: Designed to complement the body lines of compatible 2018–2023 Mustang EcoBoost models.
• Complete Rear Styling Upgrade: Combines a rear diffuser and matching side splitters for a cohesive exterior appearance.

Vehicle Fitment

• Fits 2018-2023 Ford Mustang Base / Ecoboost / Ecoboost Premium Models Only
• Only Fit Dual Rear Exit
• Will NOT Fit GT/ Mach 1 / Bullitt Models

Important: Designed for compatible EcoBoost rear bumper configurations. Not intended for Mustang GT, Mach 1, Shelby GT350, or Shelby GT500 models unless compatibility is independently confirmed.

Please verify your rear bumper configuration before purchasing.

Package Includes

• 1 × Black Rear Diffuser
• 1 × Pair of Rear Side Splitters (Left & Right)

Installation

Professional installation is recommended to ensure proper alignment and secure mounting. Installation requirements may vary depending on your Mustang’s factory rear bumper configuration. Additional preparation or modifications may be necessary.

Professional installation is recommended for all American Auto Dynamics products. Installation requirements vary by product and vehicle. To ensure proper fitment, safety, and performance, we recommend having all products installed by a qualified automotive professional.

At American Auto Dynamics, every order is inspected before shipment.

Standard gloss-black ABS and similar parts: Approximately 2-4 days.

Large carbon-fiber and made-to-order parts: Approximately 2–4 weeks.

Oversized or freight-shipped products: Additional processing or transit time may be required.

The estimate displayed on an individual product page applies to that product and takes priority over these general estimates. All timeframes are estimates and are not guaranteed delivery dates.

Tracking: A shipping confirmation email will be sent when the order ships. Tracking activity may take 24–72 hours to appear.