For two decades Porsche made the Targa with a big sunroof instead of the fabric targa top with the iconic roll bar. In the 991 we see Porsche go back to the roots in terms of design, but with a sophisticated roof mechanism. It's sexy as hell, and underneath there is a powerful 3.8 litre naturally aspirated flat-six engine. But does the design justify a significant bump on an already hefty price tag?