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Roush RSH Rear Valances - Rear Valance Aero Foil Kit (Excl. EcoBoost/GT350)
Part #: 422085
$139.99 For each
Fits On:
2018 Ford Mustang, 2019 Ford Mustang, 2020 Ford Mustang, 2021 Ford Mustang, 2022 Ford Mustang, 2023 Ford Mustang
Description:
Roush's Rear Valance Aero Foil Kit is designed to work with the factory quad-tip GT valance on 2018-2023 Mustangs, using racing-derived geometry to separate undercar airflow and adjust rear downforce. Each piece is molded from high-strength TPO via high-pressure injection for impact resistance, flexible durability, and a black stipple finish that matches OEM aesthetics. Not compatible with EcoBoost or GT350 models.
Roush's Rear Valance Aero Foil Kit is designed to work with the factory quad-tip GT valance on 2018-2023 Mustangs, using racing-derived geometry to separate undercar airflow and adjust rear downforce. Each piece is molded from high-strength TPO via high-pressure injection for impact resistance, flexible durability, and a black stipple finish that matches OEM aesthetics. Not compatible with EcoBoost or GT350 models.
Q: What is a diffuser? Why buy one?
A: A diffuser is an aerodynamic device which helps improve down force and reduce drag thus improving both speed and handling especially on the race track. Diffusers normally mount underneath your vehicle at the tail end of the car and help the high speed air under the car transition into slower flowing air at the rear of the vehicle. By making this transition smoother the vehicle becomes more slippery through the air, and by speeding up the air in front of the diffuser, the vehicle gets pulled harder toward the ground. These same principles apply to other areas on the car, so you will also see diffusers mounted on the roof or near wings on vehicles. In addition to becoming slipperier and stickier, diffusers also give your vehicle a tough aesthetic that just screams “race car”. If you are serious about going fast and minimizing lap times a diffuser is one of the most effective aero devices out there.
A: A diffuser is an aerodynamic device which helps improve down force and reduce drag thus improving both speed and handling especially on the race track. Diffusers normally mount underneath your vehicle at the tail end of the car and help the high speed air under the car transition into slower flowing air at the rear of the vehicle. By making this transition smoother the vehicle becomes more slippery through the air, and by speeding up the air in front of the diffuser, the vehicle gets pulled harder toward the ground. These same principles apply to other areas on the car, so you will also see diffusers mounted on the roof or near wings on vehicles. In addition to becoming slipperier and stickier, diffusers also give your vehicle a tough aesthetic that just screams “race car”. If you are serious about going fast and minimizing lap times a diffuser is one of the most effective aero devices out there.
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