2. 1987 BMW M6
This line got started in 1983, but reached its peak in 1987 despite the sticker-shock effect of seeing $58,720 attached to a vehicle – about $132,000 in today’s US dollars. The 1987 version upgraded by a whopping 74 horsepower over the previous year, giving it 256 horsepower at 6500 rpm. It could hit 60 miles per hour in 5.9 seconds and ran the quarter-mile in 14.5 seconds. The M series was based on BMW’s championship racing series of the late 1970s.