The 2010 Bentley Continental GTC Speed W12 is a high-performance convertible featuring a 6.0-liter twin-turbocharged W12 engine producing 600 horsepower and 553 lb-ft of torque, paired with a 6-speed automatic transmission and all-wheel drive. The GTC Speed also includes a lowered and retuned suspension with a recalibrated stability control, according to Car and Driver. The Speed model is a swankier, even more powerful version of Bentleys Continental GTC convertible. 2010 Bentley Continental GTC Speed W12 6.0L W12 Twin Turbocharged ZF 6-Speed Automatic with Tiptronic Onyx Continental GTC Speed W12, 2D Convertible, 6.0L W12 Twin Turbocharged, ZF 6-Speed Automatic with Tiptronic, AWD, Front Seat Lumbar Massage, Fully Adjustable Electric Leather Bucket Seats w/Memory, Heated front seats, Power Boot Opening and Closing, Rear-View Camera.