The VIN Numbers represent the production numbers, so a car built with the last 6 VIN digits in say the 1000's vs. the cars with a vin in the 6000's will mean the later is a car with more bugs ironed out than the earlier built car. ie The radio display issue, where the first built cars had a washed out display whereas the more recently built have had their units changed to one who's display isn't washed out.