if the cop didnt know what it was, and it looked like a high priced car and they can get a good ticket out of it...around here, they will stop you. i have been looking over my shoulder for everything lately...i have pulled over 3 times for no reason at all. i did get out of all 3, but thats besides the point.
if they find the car isnt registered (cant register it) ..etc.. they could impound it.