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Final Markdown Rear Diffuser (black) For Mustang 5.0l Gt 2018-23 | #403279 | Rtr Special: 70% Discount [stHPr15N]

$52.99 $169.99 -69%

Rear Diffuser (Textured Black)for Ford Mustang 2018-23Manufactured by RTR Vehicles | Part #403279 Add an aggressive track-inspired appearance to your GT Mustang with the same exact Rear Diffuser that is featured as original equipment on the 2018-23 M

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Final Markdown Rear Diffuser (black) For Mustang 5.0l Gt 2018-23 | #403279 | Rtr Special: 70% Discount [stHPr15N]

Rear Diffuser (Textured Black)
for Ford Mustang 2018-23

Manufactured by RTR Vehicles | Part #403279


RTR Logo

Add an aggressive track-inspired appearance to your GT Mustang with the same exact Rear Diffuser that is featured as original equipment on the 2018-23 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.

Features

  • 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
  • Installation Time: (approx) 2 Hours
  • Difficulty Level: Light to Moderate mechanical skill required
  • Fits 2018 - 2023 GT Mustang Models with Dual Quad Exhaust

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.

Installation of the RTR Rear Diffuser is simple and straightforward. 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.

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

Vehicle Applications:

  • Ford Mustang 5.0L GT 2018, 2019, 2020, 2021, 2022, 2023
  • *Designed to fit the 2018 - 2023 Ford GT Mustang models equipped with dual quad exhaust tips only. Driver and passenger side Diffusers are included.

Previously under part number 403280

What Our Customers Say

January 27, 2026

Absolutely no complaints!

This has made my daily tasks much, much, much, much easier.

- Rhisiart C..

January 27, 2026

Absolutely no complaints!

This is a superior product, and bar none at all, for sure.

- Delyth G..

January 27, 2026

Absolutely no complaints!

This is a really good and a very, very, very, very, very solid product.

- Elffin K..

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