Since unveiling the 911 in 1963, Porsche has built many dozens of variations, ranging from convertibles to racing editions to subtly tweaked versions distinguishable only to board members of the Porsche Club of America. Full-blown generational revamps have been rarer. When the seventh Porsche 911 arrives this month, 90 percent of the vehicle's components will be new or redesigned. The result is a car that corners more evenly and consumes less gas, yet is substantially quicker than its predecessors. Designers cut 100 pounds by using a higher proportion of lightweight aluminumsteel composite in the body. As the car travels faster, an adaptive rear spoiler shifts position, applying as much as 200 pounds of downforce to the rear wheels and increasing stability.
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