Here's the 997-series 911 Turbo Cabriolet, on track to be one of the most expensive cars Porsche has ever made. However, it's going to offer 190mph-odd performance despite its folding roof and the necessary extra structural reinforcements. Four-wheel drive: It also gets the latest version of Porsche's four-wheel-drive system, the 473bhp/474lb-ft engine as in the Turbo coupe, and a 0-60mph time around the four-second mark. New addition: The 911 Turbo Cabriolet is undergoing final cold-weather testing before its launch later this spring. Another new addition to the 911 range is also expected this year, the GT2. Clutchless 'box: The 'mainstream' models will also get a minor overhaul this autumn for the 2008 model-year; the Carrera S will gain an extra 15bhp for a 370bhp output, engines will gain DFI direct-injection technology and new options will include a DSG-style clutchless gearbox in place of the conventional auto.