Virgil Exner's XNR on Leno

I always wondered what happened to this car. There is a somewhat famous pic of it being driven by a Saudi sheik in the middle east somewhere that was published in an issue of National Geographic in the '70's. That was where I saw the car for the first time and have been infatuated ever since. I guess it's back on American soil? The 170 Hyperpak is quite the little motor !!