In 1938, Rudolph Caracciola drove a 5.6 liter, 753 horsepower Mercedes streamliner to 268.8 mph (432.7 km/h) on a public road, no less. Back in 1991, this bizarre Ferrari set out to beat that run.
The car is the one-off Testa D'Oro. It is a partnership between the thoroughly unhinged German tuning company Lotec (the guys who made this) and even more unhinged German designer Luigi Colani (the guy who made this). As ConceptCarz notes, Lotec twin-turbocharged the engine with 1.25 bar (18 psi) of boost, raising the five liter engine's horsepower from 390 stock to 750. Torque grew to 900 nm (664lb-ft). They also gave the engine its gold engine work, or head, for which it is named. According to Colani in this video interview, the car remains street legal in Germany.