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Italian race car constructor Coloni made a one-off racing car prototype for FIA Group-E Formula Libre called the Coloni S1 Alfa Romeo 156. The car is a carbon fibre silhouette racing car on a tubular frame, powered by a 3.0 litre Alfa Romeo V6 engine producing between 380 bhp (280 kW) and 500 bhp (370 kW). The car has a 6-speed Hewland-Coloni sequential gearbox and weighs around 900 kilograms. It is capable of achieving over 310 kilometres per hour (190 mph).
See Jan Lammers race this one-off car at Zwarkops, South-Africa: https://youtu.be/VnVm0gYb21I