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Roush Rear Valance Aero Foil Kit (18-19 GT)

Market Price $145.99 You Save 4% ($6.00)
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$139.99 (pair)

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  • Item 404870

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    Features, Video & Details

    • Aggressive Track Inspired Styling
    • Increases Rear Downforce
    • Injection Molded TPO Construction
    • Black Stipple OEM Style Finish
    • Simple Installation - Minor Drilling Required
    • Fits 2018-2019 GT Mustang Models

    Review & Installation Video

    Review & Install Video

    Track Inspired Styling. Add aggressive track inspired styling to your 2018-2019 GT Mustang by installing a Roush Rear Valance Aero Foil Kit. This Rear Valance Aero Foil attaches to your GT's rear diffuser to considerably alter the overall appearance of your Mustang's rear end. This Roush Rear Valance Aero Foil Kit is a great way to set your 2018-2019 GT Mustang apart from all the rest.

    Functional. Roush designed their Rear Valance Aero Foil Kit employing techniques used in professional racing. This Rear Valance Aero Foil will improve your 2018-2019 Mustang's aerodynamics by separating airflow beneath the car, allowing a smaller portion to follow the under-body contours, increasing rear downforce.

    Roush Quality. Roush manufactures their Rear Valance Aero Foil Kit in the USA at their own plastics manufacturing facility from OEM quality high pressure injection molded high-strength thermal plastic olefin (TPO) 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 driven vehicles. The Grille is then completed in a black, stipple textured finish for aggressive good looks.

    Simple Install - Drilling Required. Roush designed their Roush Rear Valance to install utilizing both double sided automotive tape and mechanical fasteners, so drilling will be required for installation. Roush provides the required mounting hardware and installation instructions. Installation should take about an hour to complete.

    Recommended Upgrade. Complete your 2018-2019 Mustang's aggressive track inspired appearance by installing Roush's High-Flow Lower Grille Opening Kit (part# 422081) and 3-Piece Aero Chin Spoiler (part# 422082) - sold separately.

    Application. This Roush Rear Valance Aero Foil Kit is designed to fit 2018-2019 GT Mustang models only. Does not fit V6 or Shelby GT350.

    Fitment: 2018 2019 Details

    MPN# 422085

    CA Residents: WARNING: Cancer and Reproductive Harm -

    What's in the Box
    • (1) Driver Side Rear Diffuser
    • (1) Passenger Side Rear Diffuser
    • (2) Brackets
    • (6) Self-Tapping Screws
    • (4) Bolts
    • Double-Sided Tape
    • Instructions
    Installation Info
    Will it fit my Mustang?

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    Questions & Answers (4)

    4 Top Rated Questions

    Will these fit the Roush rear valance for 2015-17 GTs?

    Will this piece fit a 2016 PP rear diffuser?

    • The Roush Rear Valance Aero Foil Kit does not fit any 2015-2017 models.

    Helpful (0)

    will this fit a 2018 eco boost with performance pack

    • This Roush Rear Valance Aero Foil Kit is designed to fit 2018 GT Mustang models only. This will not fit correctly on your 2018 Performance Package Ecoboost Mustang.

    Helpful (0)

    Will this be an exact fit with the rtr diffusers for a more aggressive look?

    • We have not tested the Roush Rear Valance Aero Foil Kit with RTR Diffusers to determine if these are compatible, however we do not believe this would be a direct fit.

    Helpful (0)
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    Customer Reviews (9) Write a Review

    Overall Rating 4.9

    out of 5 stars

    • 5/5

      December 16, 2018

      The look that kills

      Fit and finish is amazing. Really finished off the look of the defuser.


      Year: 2018 Submodel: GT

      Helpful (2)

    • 5/5

      December 13, 2018

      Great Product

      Looks Great on my 18 GT and really easy to install only took about 20 mins start to finish.


      Year: 2018 Submodel: GT

      Helpful (2)

    • 5/5

      December 11, 2018


      Good look for the back of my stang. Brings it all together with the Roush cat back. Don't know if it is does anything other then making it look good though.


      Year: 2018 Submodel: GT

      Helpful (2)

    • 5/5

      December 09, 2018

      Looks great on my GT

      I bought these so it can give a bit more of an aggressive look to the rear diffuser and it looks great by itself, but it you look carefully I pared it with the RTR quarter splitters and the back diffuser looks even better together. Amazing IMO. You be the judge. I have not seen them together anywhere in social media. I just came up with the idea and it worked perfect. I am sure you will agree that the pairing the roush valance and the RTR quarter splitters are a great combination.


      Year: 2019 Submodel: GT

      Helpful (3)

    • 5/5

      October 25, 2018

      Great product

      Install was easy and it looks great. Nice touch to the valance.


      Year: 2018 Submodel: GT

      Helpful (10)

    • 4/5

      September 27, 2018


      I like the item makes my 5.0 look different in the back more of a race car look


      Year: 2018 Submodel: GT

      Helpful (10)

    • 5/5

      September 05, 2018

      Awesome add, totally unique

      Gives that extra difference to set you apart.....very easy to install, maybe 20 minutes


      Year: 2018 Submodel: GT

      Helpful (10)

    • 5/5

      August 09, 2018

      Great Fit

      This Roush piece is essential to transform your 2018 mustang! It was a breeze to install and it completes the look of the rear end.


      Year: 2018 Submodel: GT

      Helpful (10)

    • 5/5

      April 27, 2018

      Simple and quick but makes a wonderful diff'

      This was one where I really liked some of the GT350 rear styling but don't want to do a full swap (not much available for 2018's too). This is likely just a stop gap as I'll eventually do a lot more but for now, this was a welcomed quick change that I really like.


      Year: 2018 Submodel: GT

      Helpful (13)

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