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As the fastest and most powerful 911 GT3 to date, this high-performance coupe will have a 3.8L six-cylinder boxer engine that will push 435 hp and 317 lb-ft of torque. The sultry GT3, according to Porsche, will rocket to 100 kilometres an hour in 4.1 seconds and has sharper brakes, a stiffer suspension and refined aerodynamics.