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In page Porsche 997:

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The GT3 RS is a high performance version of the GT3 with a higher engine power output, lower weight and shorter transmission ratios, as well as having upgraded body and suspension components, designed for homologating the race version of the 911 GT3. The engine was rated at 450 PS (331 kW; 444 bhp) at 7,900 rpm and 430 N⋅m (317 lb⋅ft) at 6,750 rpm with a maximum engine speed of 8,500 rpm.[1] The "RS" stands for "rennsport", the German word for "racing" (literally, "race sport").