Nope. I've never even seen it. As far as I know it only went around 30 mph and drove horribly, but it wasn't really a real car.
They sold one of the GR-1s. I think the other is still over at a facility where they store a number of show cars. They just kind of sit in there gathering dust. When we went to Vegas and they shipped the polished GR-1 and the Cobra Concept out, I went out for something over there and it's just a nondescript warehouse without much going on.