2012 BMW M6 Convertible

The new BMW M6 Convertible is the most expensive version of the 6 Series Convertible, and a rival to rapid four-seater drop-tops such as the Porsche 911 Cabriolet. You could also consider it as a rival to the Mercedes SL63 AMG. With a 4.4-litre twin-turbo V8 that delivers 680Nm of torque, you’ll need all the stopping power you can get – and taking the roof off has done nothing to blunt performance. It goes from 0-62mph, with a time of 4.3 seconds, and limited 155mph top speed.

The roof can be lowered at speeds of up to 25mph and takes 19 seconds to fold away (24 seconds to raise). It does a combined mpg of 27.4 mpg. The BMW M6 is one of the most complete cars in its class. The new M6 is on sale now, at £99,020.