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Roush Rear Valance Aero Foil Kit (18-21 GT; 19-21 EcoBoost w/ Active Exhaust)

Item 404870
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Market Price $172.49 You Save 13% ($22.50)
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$149.99 (pair)

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      Video Review & Installation

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • Aggressive Track Inspired Styling
      • Increases Rear Downforce
      • Injection Molded TPO Construction
      • Black Stipple OEM Style Finish
      • Simple Installation - Minor Drilling Required
      • Fits 2018-2021 GT Mustang and 2019-2021 EcoBoost Mustangs with Active Exhaust


      Track Inspired Styling. Add aggressive track inspired styling to your 2018-2021 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 2018-2021 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 2018-2021 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 2018-2021 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 2018-2021 GT Mustang and 2019-2021 EcoBoost Models with the Active Exhaust only. Does not fit V6 or Shelby GT350.

      Fitment: 2018 2019 2020 2021 Details

      Roush 422085

      CA Residents: WARNING: Cancer and Reproductive Harm -

      Installation & What's in the Box

      Installation Info

      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

      Customer Reviews (45)

        Questions & Answers

        10 More Questions

        Will It Fit My Mustang

        • EcoBoost - 19, 20, 21
        • GT - 18, 19, 20, 21