From Ferrari Wiki
The Ferrari FX is a Ferrari automobile which was custom made for the Sultan of Brunei by Pininfarina. It featured the Flat 12 engine of the Ferrari Testarossa and a 7 speed sequential Transmission (mechanics) from the WilliamsF1 BMW Formula 1 team. Only seven cars were ever made, six of which were delivered to the Royal Family in Brunei. Dick Marconi managed to acquire the fourth vehicle from WilliamsF1 before it shipped to Brunei and it is now on display at the Marconi Museum in Tustin, California.