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Porsche's web-site shows 20 different 911 models available (not including the 911 R) including the Carrera, Targa, Turbo, GTS and GT3. For the Carrera, Targa and GTS versions you can choose some version of all-wheel drive: Carrera 4, Carrera 4S, Targa 4S, and so on. But how do you choose? What are the major differences between Porsche's all-wheel …