2015-2021 Mustang Rear Diffuser (2018+ GT shown in pictures)


Sale price $349.95 Regular price $369.95

Shipping calculated at checkout.

*FITS '15 - '17 non-premium, '15 - '17 premium, and '18+ GTs*


A part of the EMP premium line of Mustang products made in the USA from 1/8" aluminum and powder coated matte black, this rear diffuser will definitely make you stand out from the rest with aggressive styling and quality above the other diffusers out there. Diffuser blades on stock diffuser are centered with the EMP diffuser blades for a clean professional look unlike the uncentered lopsided blades of our competitors diffusers. Easiest install of all the diffusers on the market with mounting holes (yes the competition has NO mounting holes so you just guess where to put the screws in), slotted attachment to two existing bolts to ensure center section is perfectly centered and adjustable to get the desired gap from rear of car. Comes with black stainless steel screws, nuts, bolts, brackets and stainless steel lock washers (plus use of two existing bolts on car). Strong and remained steady during 100 MPH wind test. Easy installation - installation video at bottom of page.

Specifically designed for 2015-21 Mustangs with stock diffusers shown in pictures above (will not fit California Special or Mach 1).

Order cancellations are subject to a 3% fee.

(Optional glossy black shown in pictures above. White edges can be painted by buyer if desired.)



• Premium Rear Diffuser is Made in the USA from 1/8” Aluminum

• Powder Coated Matte Black for High Durability and Enduring Good Looks

• Adjustable So You Can Set at the Desired Distance from Rear of Car

• Exotic Muscle Addition That Will Make Your Mustang Stand Out

• Simple Screw-In Installation. Step-By-Step Instructions Provided.

• Custom Made for the 2015-2021 S550 Mustang GT models (see above) (will not fit California Special or Mach 1)



Exotic Muscle Styling. Premium adjustable rear diffuser custom designed to match the contours of your Mustang and stand out from the others. Adds an aggressive low look that will turn heads wherever you go.


EMP Precision Quality. Made in the USA from 1/8” aluminum then powder coated matte black for a strong durable finish. Precision machined for a great fitting high quality product.


Simple Screw-In Installation. Unlike other rear diffusers, this diffuser has mounting holes so it can be screwed securely to your stock diffuser underside using existing screws plus additional provided stainless steel screws and lock washers. No random holes, missed connections leaving ugly extra holes or crooked uncentered mounting like the other diffusers. Slotted mount to adjust distance from side of car. Assembly required before installation.


Application. Custom designed for 2015-2021 S550 Mustang GT with stock rear diffuser (will not fit California Special or Mach 1).




Installation Info


Installation Time

(approx) 1 Hour


Difficulty Level:



Installation Guide

Printed installation guide (PDF can be downloaded by clicking here)


What’s in the Box

  • (1) Rear Diffuser Center Section
  • (2) Rear Diffuser Driver and Passenger Side Blades
  • Stainless Steel Assembly and Mounting Hardware
  • Assembly and Installation Guide


Installation Video available on YouTube!