Lotec Sirius
The Sirius is one of the most obscure European supercars due to several reasons. The Lotec Company produced it in the early 2000s. The prototype caused much attention when it was first shown in 2001, but ever since, news about this crazy supercar has been pretty scarce. Some say that only two examples left the factory, and others claim the Sirius never progressed beyond the prototype stage (via BTR).
However, the Sirius is still one of the most potent and exciting machines. Its heart is a twin-turbo Mercedes V12 engine that develops around 1300 hp. The Sirius is unbelievably fast, with a five-speed manual transmission and just 2800 pounds of curb weight. It can accelerate from 0 to 60 mph in less than 3.7 seconds and its top speed is an insane 285 mph.