The new, fifth-generation 911 Turbo is not only the fastest-ever street-legal 911, it's also the most refined. Spooling up to 125 miles an hour -- on the German autobahn, of course -- is utterly effortless in this all-wheel-drive sports car. And the urge to push the needle deeper, to tap into its extraordinary acceleration, is very difficult to resist. The water-cooled 24-valve 3.6-liter boxer is, in fact, a turbocharged version of the dry-sump 911 GT3/GT1 engine, rather than a blown and enlarged variant of the naturally aspirated 911's 3.4-liter powerplant. It shares the block, the pistons, and the camshaft's chain drive with the GT3 and uses the same head castings, smaller valves, and a different combustion-chamber shape. For the Turbo, Porsche's VarioCam Plus system offers two intake timing positions rather than the infinitely variable setup of the GT3. - Car and Driver
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