The Porsche 911 became an icon almost the instant it arrived nearly 50 years ago, so when it comes up for a redesign, relatively small steps have usually won the day. Bowing at the 2011 Frankfurt auto show, the seventh-generation 911 Carrera and Carrera S may look to follow that pattern at first blush, but there are some radical changes—albeit not as large as the shift from air- to water-cooled engines—underneath the largely familiar shape.
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