One of our eagle-eyed forum moderators discovered this Ferrari Enzo Prototype for sale. The car is apparently the only working test car for the Enzo and comes with certification to prove it! It uses an engine similar to the 1991 Formula One car with 680PS.
The car is a real collectors piece and will probably end up in a private collection. It’s for sale via Modena Motorsport and can be found via this link, where more pictures are also available!