I'll give ya a hint: The 499 on the plate had something to do with the price, and it goes really fast while it is parked. It really is a very very Fast. And probably less than 3' tall from the ground.
Corvette's don't cost $499k. Is that a better clue, or do you need more? No, it was not a Mercedes. A better clue might be that there is a kit for about $500 to open your cars doors like its do.
Tom, You got it. But, with a clue like that how could you miss. One does not see to many of those around. Even the door pull handles were built into the lines of the body.