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  Seats could use more lateral support, steering-wheel spokes are too thick. Surprisingly, the steering-assist mech­anism is identical to that of the E430, and it remains light at most speeds. So light that the mechanism in a BMW 328i feels leaden in comparison. But it directs the E55 with such accuracy and fluency that more weight at the rim doesn't seem nec­essary . In fact, when you add the car's tenacious grip (0.88 g on the skidpad) and tightly tied-down body motions to the razor-sharp helm, the E55 can take on almost anything in the corners. But be warned, the driver will likely need some recalibration; the car's abundantly stiff structure and good isolation lead one to underestimate corner entry speeds. On the introductory ride-and-drive in Napa, California, a couple of drivers from other publications went off the road, and we suspect that those incidents were partly due to the decep­tive ease with which this car gathers speed. What shouldn't go unno­ticed in the...