The 991 codenamed GT3 RS is a lightweight track-focused model offered within Porsche's 911 model lineup. Unlike previous generation models, the 991 no longer offers a manual transmission and is exclusively available with Porsche's PDK automatic transmission.
There was much consternation over potential changes to the track-focused, top-of-the-line neunelf (that’s German for “911”) before its release. Would Porsche move the engine from Ferdinand Porsche’s anointed rear-placement? Would turbo-charging be utilized? In the end, the answer was no to both questions. The latest GT3 RS is naturally-aspirated and the incredible 4.0-liter flat-six is in the rear, where it was meant to be. Adding to 500 horsepower and its screaming-high redline, the RS is 22 pounds lighter than the already lithe GT3. Rear-wheel steering and all the accouterments of the best track car on the planet are also right where they should be.
Following the tradition of Porsche's RS cars, the 991 draws power from a 'Mezger' naturally aspirated flat-six engine bored out to four litres. It revs up to 8800 rpm and produces 493 hp (500 PS; 368 kW) and 339 ft·lb (460 Nm) of torque. The 991 GT3 RS is only available with a 7-speed dual-clutch transmission and weighs 3131 lb (1420 kg), making it one of the lightest cars of Porsche's current lineup.