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

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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 - www.P65Warnings.ca.gov

    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?

      Customer Photos (18) Submit Your Photo

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        Questions & Answers (6)

        5 Top Rated Questions

        Will this fit on a 2019 mustang EcoBoost non performance pack but with active exhaust?

        Can you provide data that shows that this kit is functional? I love the look but don't want to drill any holes without knowing a general estimate of how this 'fucntional' aero foil kit impacts downforce and drag coefficient.

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

        • Unfortunately it will not work with the 15-17 Mustang models. Only the 18-19.

        Helpful (0)

        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)
        Post Your Question
        1 More Question
        Will this be an exact fit with the rtr diffusers for a more aggressive look? 1 answer

          Customer Reviews (20) Write a Review

          Overall Rating 4.8

          out of 5 stars




          • 5/5

            July 11, 2019

            Roush is the Best

            Love the styling and factory look, follow my build @venom_gts550

            DAVID

            Year: 2019 Submodel: GT

            Helpful (0)

          • 5/5

            June 27, 2019

            Great Looking Product.

            These Roush Diffusers are very nice. The fit is perfect and installs in just a few minutes.

            PatB

            Year: 2019 Submodel: GT

            Helpful (0)

          • 4/5

            June 15, 2019

            Love the way these look!

            These look super fierce and wasn’t hard to install, took about an hour.

            Viktoria

            Year: 2018 Submodel: GT

            Helpful (0)

          • 5/5

            June 14, 2019

            Roush Rear Valance kit

            It’s an easy direct fit and looks amazing. Highly recommended.

            Venom

            Year: 2019 Submodel: GT

            Helpful (0)

          • 5/5

            June 06, 2019

            Fit Perfect

            Awesome Product Quick Install Customer Is Very Happy

            KENNETH

            Year: 2010 Submodel: GT

            Helpful (0)

          • 5/5

            May 13, 2019

            looks great

            Looks great on my GT pp1 and was easy to install. Less than 15 minutes.

            DuvalB

            Year: 2019 Submodel: GT

            Helpful (0)

          • 5/5

            May 08, 2019

            Easy, great looking mod

            20 minute install, and I was on the road again with a better looking back side than I have had since high school. All the Camaro guys get to see this mod a lot!

            JohnS

            Year: 2018 Submodel: GT

            Helpful (0)

          • 5/5

            May 04, 2019

            Look Awesome

            Great low cost ad for the appearance. Easy install

            Bisko

            Year: 2018 Submodel: GT

            Helpful (0)

          • 4/5

            April 22, 2019

            Roush Rear Valance Foil

            Very easy to install and killer looks. I hope the self tapping screws hold it in place over time.

            PaulN

            Year: 2018 Submodel: GT

            Helpful (0)

          • 5/5

            April 14, 2019

            Rousch Rear Aero Foil

            Great add to my 2019 GT, very easy to install. Very happy with looks.

            BillM59

            Year: 2019 Submodel: GT

            Helpful (0)

          • 5/5

            March 21, 2019

            Easy Install

            Took approx 30 min start to finish. I found it easier to lift my car on jackstands to get more space under the bumper. Looks great and they are very sturdy.

            MattM

            Year: 2018 Submodel: GT

            Helpful (0)

          • 5/5

            December 16, 2018

            The look that kills

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

            16boostedbullitt

            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.

            StefenN

            Year: 2018 Submodel: GT

            Helpful (3)

          • 5/5

            December 11, 2018

            Nice

            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.

            DavidY

            Year: 2018 Submodel: GT

            Helpful (3)

          • 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.

            CarlosC

            Year: 2019 Submodel: GT

            Helpful (7)

          • 5/5

            October 25, 2018

            Great product

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

            zirfj

            Year: 2018 Submodel: GT

            Helpful (10)

          • 4/5

            September 27, 2018

            Style

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

            Bobby

            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

            DaveM

            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.

            JP

            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.

            Xavier

            Year: 2018 Submodel: GT

            Helpful (13)

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