Differences between the BMW 650Ci and the M6 are equally subtle. Open the door, and illuminated sill trim with the M6 logo reminds the driver that this is a special BMW. Once inside and facing the tilt-and-telescopic M sport steering wheel with its thumb rests and “M” button, the driver finds a unique gauge set. Outer rings are finished in titanium, inner scale rings are illuminated, red needles point at white markings, and an M logo makes them even more distinctive. The speedometer reads to 200 mph, and the tachometer is metered up to 9,000 rpm. The M6 also includes an oil temperature display on the tachometer, and because oil temp is so critical on a vehicle like this, the driver can also program oil temperature to display in place of average speed in the trip computer. Heated M sport seats with standard 14-way power adjustment straddle the illuminated SMG gear selector, which is surrounded by Power, DSC, EDC, and SMG buttons.