Was driving on I86 near Corning,NY headed west. Seen a new white mustang coming up behind me. No emblems on the front or back. All white hardtop with black roof, hood and black patch's on the car. Grill was just blacked out along with rear of the car. Car came by and it had 5.0 with "Roush" above the emblem and "Supercharged" below the emblem. Car had Michigan factory test pre production plates on it. Or whatever the plates are called. Couldnt grab my phone in time. Anybody know anything about these??