time for some info, the driveshaft on the z is a carbon fiber reinforced plastic, when they were making the plastic the mixed in a bunch of long strands of carbon fiber, they spin it and pump it through an extruder and mold the ends, true carbon fiber driveshafts are made from dry prepreg carbon sheets wound on a mandrel and autoclaved and significantly lighter and stronger tube, but at this point the heaviest parts of the drive shaft are going to be the ends anyway so not much weight left to gain. The g37's really benefit from this as they have two peice steel rear driveshafts so when they put a good aluminum shaft on they lose a solid 15lbs or more. the joints and journals on an average driveshaft weigh around 3-6lbs apiece so we have 2 and they have 4 the joints also draw a tiny amount of horsepower to redirect the power as the driveshaft moves so by getting rid of 2 joints and the carrier bearing they gain some more power there. more to the point of the Op's question all the 2door cars have carbon shafts the 4 door G's have 2 piece steel and awd drive has a 2 piece rear and a steel front shaft
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