In April 2011 Porsche revealed the final evolution of the 997, the 911 GT3 RS 4.0. It featured a 4.0-litre engine utilizing the crankshaft from the GT3 RSR with increased stroke dimensions (from 76.4 mm to 80.4 mm). This increased the power to output to 500 PS (368 kW; 493 bhp) at 8,250 rpm and 460 N⋅m (339 lbf⋅ft) of torque at 5,750 rpm. Chassis development was influenced by the GT2 RS and uses parts sourced from other RS 911 models. Front dive planes provided additional downforce up front. The car weighs in at 1,370 kg (3,020 lb), giving it a power-to-weight ratio of 370 PS per ton. Production was limited to only 600 cars.
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