Porsche is adding two new models to the 911 range: the 911 Turbo Cabriolet and 911 Turbo S Cabriolet. These new models combine the dynamic range of the new 911 Turbo models with the driving pleasure offered by an open-top sports car. 50 years after the 911 made its debut, and coinciding with the 40th anniversary of the 911 Turbo, the open-top versions of the 911 Turbo and 911 Turbo S are make their global debut at the Los Angeles International Auto Show on November 20, 2013. By adding the two new 911 Turbo models into the mix, Porsche is doubling its offering of the top-of-the-range models to four versions.In extending the range, the 911 Turbo Cabriolet and 911 Turbo S Cabriolet deliver the same blend of sporty dynamism, performance and efficiency offered by the Coupe model unveiled a few months ago. The twin-turbocharged 3.8-liter six-cylinder engine delivers 520 hp in the open-top 911 Turbo and 560 hp in the S model. The cars accelerate from zero to 60mph in 3.3 and 3.1 seconds resp