Nice as it may be, the BMW 6 Series convertible doesn't really make our heart beat any faster. It's a soft, plush open-top tourer, and though the 4.4-liter twin-turbocharged V8 underhood certainly doesn't skimp on the power, it doesn't really make for an enthusiastic driving experience.
Alpina is adding a ragtop BMW 6-Series to its lineup of muscle-bound Bavarians. Set to debut in Frankfurt, the 2012 BMW Alpina B6 Biturbo Convertible should have enough muscle to hustle to 60 in just 4.8 seconds. The big droptop packs 507 hp and 516 lb. ft. of torque thanks to a twin-turbo V8.
Click above for a high-res image of the 2009 BMW Alpina B7 Bi-Turbo
Click the pic above for more high-res shots of the BRABUS Bullit.