I was pulling up to work and saw a guy parking a pitch black New M6. That thing was insane, 4 exhaust pipes, 19 inch wheels and fantastic looks. License plates were rather wierd though, it had only 4 letters and some small letters going up and down on the sides. Seemed like a dealer show car to me, awesome ride.

Dealer plates in the us have a plate number followed by a letter, a number, and then 2 more letters. Example 12 D5RS what you describe sounds like a manufacturer plate. Yeah I saw a new M6 the other day and they are really sweet.