BMW has revealed the new M4 Convertible - the fifth-generation open-top car to bear the M badge. Powered by the same 431bhp six-cylinder engine as the M4 Coupe, it will get from 0 to 62mph in 4.4 seconds with the optional seven-speed M Double Clutch Transmission. Despite having more equipment, it's around 60kg lighter than the outgoing M3 Convertible and features a three-part metal roof that can open fully in just 20 seconds. Sales kick off in September with prices starting from just over £60,000 on the road.