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Roush Rear Valance Aero Foil Kit (18-20 GT; 19-20 EcoBoost w/ Active Exhaust)

Item 404870
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Market Price $145.99 You Save 4% ($6.00)
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$139.99 (pair)

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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 2018-2020 GT Mustang and 2019-2020 EcoBoost Mustangs with Active Exhaust

    Review & Installation Video

    Review & Install Video

    Track Inspired Styling. Add aggressive track inspired styling to your 2018-2020 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 2018-2020 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 2018-2020 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 2018-2020 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 2018-2020 GT Mustang and 2019-2020 EcoBoost Models with the Active Exhaust only. Does not fit V6 or Shelby GT350.

    Fitment: 2018 2019 2020 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 (40) Submit Your Photo

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        Questions & Answers (6)

        5 Top Rated Questions

        Will this install if I already have the MMD Rear Diffuser Fins in place? Item 406534-NL

        • The MMD Rear Diffuser fins will not fit on this rear valance.

        Helpful (0)

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

        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 (26) Write a Review

          Overall Rating 4.8

          out of 5 stars




          • 4/5

            October 30, 2019

            Roush Rear Valance Aero Foil Kit

            Easy to install and made the car POP. Good quality but still pricey for what you get

            TWHITE

            Year: 2019 Submodel: GT

            Helpful (0)

          • 5/5

            October 10, 2019

            The aggressive look I needed!

            I knew I needed something to make my GT look more aggressive from the back, but I didn't know what would really make it pop like I envisioned. So I ordered this Roush valence and man, this is exactly what I had in mind! It adds a very aggressive, mean look to the back end of your Mustang! Definitely recommend adding a spoiler as well if you want to complete the aggressive look. Install was very simple, took about 30 minutes in the driveway. Looks OEM. Very satisfied!

            BrandonButch

            Year: 2018 Submodel: GT

            Helpful (0)

          • 5/5

            October 07, 2019

            Roush rear aero foil

            Very easy to install dresses up the rear end just Jack up one side of the car and everything can be done with no problems recommended for 2019 mustang gt 5.0 owners

            MiltonR

            Year: 2019 Submodel: GT

            Helpful (0)

          • 5/5

            September 23, 2019

            Adds a nice twist to the back end

            fit is perfect and is a very noticeable line change

            Browningbuck

            Year: 2019 Submodel: GT

            Helpful (0)

          • 4/5

            August 29, 2019

            Nice Addition To Rear Valance Area

            The Roush Rear Aero Foil Kit is easy to install and adds a little exotic car look to that area of my GT. I've heard there is also an Aerodynamic effect with this kit, for those that take their cars to the track.

            dlramGT

            Year: 2019 Submodel: GT

            Helpful (0)

          • 5/5

            August 11, 2019

            Fast Easy install, "Aressive Appearance"

            Only took 20 minutes to install, and the Roush Air Foil kit improved the look of the rear end valance. The car now has a more aggressive and lower appearance from the rear. The quality of the kit is OEM fit and finish. I absolutely love the new look of the valance and would highly recommend to anyone who. wants to make their car stand out and have a unique appearance.

            FullAutoGT

            Year: 2018 Submodel: GT

            Helpful (0)

          • 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 (1)

          • 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 (1)

          • 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)

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