BMW M4 Convertibe BiTurbo DCT Finished In Silverstone Metallic With 43,000 Miles, Optional Specification Includes: M Double Clutch Transmission with Drivelogic £2,645 Convertible Comfort package £695 Loudspeaker system - harman/kardon £675 High-beam assistant £150 Front armrest with sliding function £140 Extended Merino leather Black, Silverstone Metallic Reverse Camera, Front & Rear Parking Sensors, Automatic LED Headlights,