"The 4-wheel drive system of Panamera is similar to Cayenne. A multi-plate clutch located just behind the transmission facilitates a front-to-rear torque split of 38:62. The front differential is bolted on the side of the engine and has its axle goes through the sump. The rear differential has an electronic controlled variable limited slip ratio to enhance its cornering prowess. With a front-to-rear weight distribution of 52:48, the Panamera is better balanced than most performance saloons bar Maserati Quattroporte (which achieves 49:51). However, most of its engine locates fore of the front axle, meaning its polar moment of inertia is not low."
http://www.germancarforum.com/threads/p ... vel.29053/