The Maybach in Midnight Club 3 Dub Edition.
So this was a car that was meant to be in the game at one point, but was cut sometime before release for some reason.
GrandTheftAero made a video about this game, and in that video, he plays some audio from a former Rockstar dev talking about the car; unfortunately, he doesn't know why it was cut, but he did mention it was being worked on at one point. Sadly, about the only thing that remains of the car in the final is some mentions in the game files and the car's wheels, which can be accessed through hacking.
However, just last week, an alpha build of this game was found, and in it was the aforementioned Maybach, which had previously never been seen in this game until then. The car is not finished; namely, vinyls are not mapped properly, LOD's aren't right, and there's probably more I am not aware of, but the car looks to be most of the way there. It's a pity it never made it to the final game because it looks great and fits in with the rest of the game's car list remarkably well. Fortunately, modding in MC3 is a thing, and although it is in its infancy, it should only be a matter of time before someone fixes this thing up and ports it to the final game. I am hoping someone will eventually figure out how to add cars to the game instead of replacing them, because this Maybach is begging for it!