The Porsche 911 GT3 RS (991) is a track-oriented Porsche 991 first shown at the 2015 Geneva Motor Show. It produces more power than that of the GT3 (991), and that of the previous generation GT3 RS (997.2). It is also the first mainstream production 911 GT3 to be fitted with a 4-litre engine, as opposed to that fitted in the limited production GT3 RS 4.0 (997). It is fitted with the Turbo (991)'s rear body panels, a perspex rear window, a magnesium roof, carbon fibre front wings, a carbon fibre bonnet, a carbon fibre bootlid, altered anti-roll bars, and a shortened final drive ratio.