Enter To Win A $500 RTR Gift Card Here

RTR Rear Diffuser (18-21 Mustang - GT, Ecoboost w/ Active Exhaust Only)

Product Information

  • RTR Aggressive Track Inspired Styling
  • Durable Injection Molded TPO Material
  • Features a Grained Texture
  • Straight Forward Installation - Cutting is Required
  • Sold as a Pair; Driver and Passenger Side Included
  • Fits 2018 - 2021 GT Mustang Models with Dual Quad Exhaust

Modern Aggressive RTR Styling

Add an aggressive track inspired appearance to your GT Mustang with the same exact Rear Diffuser that is featured as original equipment on the 2018 - 2021 Mustang RTR. Designed and developed in conjunction with Vaughn Gittin Jr., this RTR Diffuser was designed to offer a tastefully more pronounced Rear diffuser for those who want a bit more in comparison to the subtle factory rear diffuser.

High-Quality TPO Construction

RTR manufactures its Rear Diffuser from an injection molded thermal plastic olefin (TPO) material using the original OEM CAD data from Ford to ensure a perfect fit. TPO is an extremely strong material known for its light-weight, superior durability, and impact resistance - making it perfect to withstand the hazards of daily driving. This Rear Diffuser is completed in a fine-grained stippled texture for a factory look that helps to hide the appearance of rock and stone impacts.

Straight Forward Installation

Installation of the RTR Rear Diffuser is simple and straight forward. The Diffuser installs easily with a combination of hardware and 3M automotive bonding tape. However, it will require permanent modification to the stock rear bumper cover to remove a section of the factory diffuser. Installation can be completed in about two hours.


This RTR Rear Diffuser is designed to fit the 2018 - 2021 Ford GT Mustang models equipped with dual quad exhaust tips only. Driver and passenger side Diffusers are included.

What's in the Box:

  • (1) Driver / Left Side Rear Diffuser
  • (1) Passenger / Right Side Rear Diffuser
  • (2) Diffuser Brackets
  • (4) 5mm x 10mm Short Screws
  • (2) 5mm x 20mm Long Screws
  • (4) 5mm Washers
  • (1) Adhesion Promoter

Installation Time: (approx) 2 Hours

Difficulty Level:Light to Moderate mechanical skill required

RTR Vehicles Military Discount

This offer is eligible for:

Current & former U.S. military, Military spouses & dependents, First responders including law enforcement, fire, and EMS, Federal, state, and local government employees

How it works:

Click the button to claim your discount and you'll be asked to verify your affiliation with GovX ID. Verification is real-time and secure. If you already have a GovX ID account, just log in! After you verify, you'll receive a single-use discount code to apply at checkout. Be sure to copy your code. For future purchases, simply log in with your GovX ID to unlock a new discount code. There is a limit of one discount code per day.

Customer Reviews
5.0 Based on 1 Reviews
Write a Review Ask a Question
  • Reviews
  • Questions

Thank you for submitting a review!

Your input is very much appreciated. Share it with your friends so they can enjoy it too!

Filter Reviews:
    Steve A.
    United States United States

    High quality, perfect fit, easy install. Love the aggressive look it gave my 2020 HPP.

    RTR Vehicles RTR Rear Diffuser (18-21 Mustang - GT, Ecoboost w/ Active Exhaust Only) Review


    Welcome Newcomer