The open top pairing follows closely on the heels of the recently introduced 911 Turbo and Turbo S coupe, boasting a unique body that is 28mm wider than that of the widest of existing 911 models, the Carrera 4.
A revised fabric roof, now fitted with a lightweight magnesium frame, opens and stows in a dedicated compartment behind the cabin in 13.0sec at speeds up to 37mph.
Power hails from a newly developed turbocharged version of Porsche’s 3.8-litre flat six petrol engine developing 513bhp in the 911 Turbo cabriolet and 552bhp in the 911 Turbo S cabriolet.
Official figures point to 0-62mph times of 3.5sec and 3.2sec respectively. Top speed in both models is put at 198mph. Fuel economy has improved by 30 per cent at a claimed 28.5mpg.
Read more 2013 LA motor show news.