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Comes from Wikipedia, but is accurate.

The Maybach Exelero is a high-performance super car designed and built by luxury car manufacturer Maybach, and presented in May 2005. The 700 hp (SAE) (514 kW) two-seater with a bi-turbo V12 engine is a one-off design commissioned by Fulda Tyres. Fulda is using this car as a reference vehicle to test a new generation of wide tires. The German luxury car manufacturer created the one-off model as a modern interpretation of its legendary streamlined car of the 1930s. There are various allusions to the historical predecessor, which was likewise based on a powerful Maybach automobile, in this case the Maybach SW 38, and was also used by Fulda for tire testing.