just 9.9 lb/bhp. Acceleration to 60 mph (100 km/h) comes in 4.8 seconds and top speed is limited electronically to 155 mph (249 km/h).   Future Z10/M10 : A supercar to succeed the Z8 , will likely compete with the Audi R8 and forthcoming Mercedes-Benz SLC ; in late September 2007 BMW Group registered the