This new 2013 Bentley Continental GT Speed Convertible is one of the last models in Bentley’s Continental range to receive its mid-cycle update, with new versions of the Supersports and Flying Spur now the only models still under wraps. The GT Speed Convertible, like its hardtop cousin, gets a twin-turbocharged 6.0-liter W-12 engine rated at 616 horsepower and 590 pound-feet of torque. The mighty powerplant is matched to the latest ZF eight-speed automatic transmission and drives all four wheels via a Torsen center differential.