I am pretty sure its John Carmacks car. He is the brain behind ID software and produced the "Doom" series. Evidently he had Norwood do the conversion as there wasn't enough "punch" for his tastes.
Word on the street (in the Supercars Forum here) is that Carmack's car has had the turbos removed and is for sale as a regular F50. As for the Koenig TT, it is still undetermined.
http://fast-autos.net/koenig/koenigf50.html Theres a little bit of info about this piece of unbelievable art.
I actually have the video from which the pictures of the link are appearing from. Its a pity i cannot load it on here
