The fundamental differentiator between this new model I’m driving here and the original coupe, of course, is the folding fabric roof. The exact weight to the car as a result of the roof, its actuators, and the structural changes to maintain chassis rigidity, is around 80 lbs, which is remarkably little. How do they do this? Porsche has engineered a magnesium “panel bow” structure for the tightly stretched roof fabric that significantly lessens the mass, while also maintaining perfectly the roof line as established by the hardtop 991 911. The main aesthetic result being that this cabriolet looks just as good as the coupe when it’s closed. Under the stretched fabric are four solid magnesium panels – the front section that attaches to the windscreen frame, two center segments, and the rear window whose framing is likewise in magnesium. While opening, the four segments lay one on top of the other neatly while the fabric part folds as before in a Z configuration. This all disappears into a rear bin over the engine compartment that is 9.0 inches deep and 21.7 inches across. - See more at: http://rawautos.com/2012/02/first-drive ... AtJIc.dpuf