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The latest limited-edition 911, the 2011 Porsche 911 GT3 RS 4.0. It packs a 4.0-liter flat-six derived from the 911 GT3 RSR racer, complete with forged pistons, titanium connecting rods and a crankshaft pulled directly from its track-bred descendent. with 500 horsepower, from 0-60mph in just 3.9 seconds, crack 124 mph in less than 12 seconds and top out at 193 mph. The price is $185,000, and only 600 will be produced when sales begin later this year.