911 Turbo and Turbo S Coupé will now be joined by 911 Turbo Cabriolet

Making their worldwide public debut at the LA Auto Show in November

The dynamic capabilities of the new 911 Turbo models combined with the driving pleasure offered by an open-top sports car: this is the compelling formula behind two new flagship 911 Cabriolet models, the Turbo and Turbo S. Some 50 years after the 911 first appeared and to coincide with the 40th anniversary of the 911 Turbo, Cabriolet versions of this iconic model are making their global debut. The pair will be unveiled to the public for the first time at the Auto Show in Los Angeles on 20 November.

Watch the Drive.co.uk 10 Second HD Car Video of the New 2014 911 Turbo Cabriolet

The Porsche 911 Turbo Cabriolet and 911 Turbo S Cabriolet deliver the same blend of dynamism, performance and efficiency offered by the Coupé model unveiled just a few months ago. The turbocharged 3.8-litre six-cylinder engine delivers 520 hp (383 kW) in the open-top 911 Turbo and 560 hp (412 kW) in the S model. The cars accelerate from zero to 100 km/h (62 mph) in 3.5 and 3.2 seconds respectively, reaching a top speed of up to 197 mph. And all this while achieving fuel consumption figures not typically associated with such high performance: both new models return 28.5 mpg on the New European Driving Cycle (NEDC), with CO₂emissions of 231 g/km. When compared against their respective predecessors, the new cars deliver 30 hp more power and are 0.2 seconds faster in terms of 0 to 62 mph acceleration. They are also up to 15% more efficient.

Recommended UK retail prices (including VAT): £126,766 for the Porsche 911 Turbo Cabriolet, £149,511 for the Porsche 911 Turbo S Cabriolet; on sale from December

Read More Porsche News and Reviews at Drive.co.uk/PORSCHE