New Porsche 963 RSP (left), 1970s 917 Le Mans race car (right).

The 963 RSP was built by Porsche's Sonderwunsch bespoke arm based in Atlanta, US.

The road-legal 963 RSP has indicators and numberplates.

963's hinges and wing connectors are all finished in satin black.

It was a challenge for Sonderwunsch to tan the interior and apply ‘Martini’ silver paint as the 963 RSP is entirely made of carbon fibre.

The 963 RSP derives its 680hp-4.6-litre twin-turbocharged V8 from the Porsche 918 Spyder, but it also adds a hybrid system.

Porsche 917 of the 1970s has a 0-100kph time of around 3 seconds and a 330kph top speed.

Porsche has not revealed the 963 RSP's 0 to 100kph and top speed figures, however, they are estimated to be around the 917's numbers.

The Porsche 963 RSP competes in the same class as the Ferrari 499, Alpine A424 and BMW M Hybrid V8.