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You are forgiven if you believe that just about the last thing the Porsche 911 needs is four-wheel drive. After all, the boxer engine sits right on top of the driven wheels, so a lack of traction is rarely an issue. Nevertheless, since 1989 (when the first 911 Carrera 4 was launched), 41 percent of all 911s sold drive all four wheels. The latest 911 with this technology is the widebody, wide-track 991 Carrera 4, which commands a nearly $9000 premium over the standard rear-wheel-drive model. Is this an extra worth having?