While testing the revised Mustang on the track, vehicle dynamics engineer Mike Del Zio wasn't satisfied with how the car was gripping around corners. Despite wind tunnel tests providing evidence to the contrary, the Mustang wasn't as responsive as it should have been in the turns.

Aerodynamics engineer Jonathan Gesek pulled a trick out of the NASCAR playbook and stuck a piece of duct tape over the lower gap in the front grille. NASCAR often uses duct tape on the front of cars to strike a delicate balance between optimum aerodynamics and allowing just enough air to enter the radiator to keep the engine from overheating. Here, Gesek hoped that the blocked grille would reduce lift and help the front of the car stick to the road better.