The 991 codenamed GT3 RS is a lightweight track-focused model offered within Porsche's 911 model lineup. Unlike previous generation models, the 991 GT3 RS 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 naturally aspirated flat-six engine bored out to four litres. The engine is based off of the GT3 RSR car, which itself is based off of the engine from the Carrera. It revs up to 8800 rpm and produces 493 hp (368 kW) and 339 ft·lb (460 N·m) of torque. The 991 GT3 RS is only available with a 7-speed PDK transmission and weighs 3131 lb (1420 kg), making it one of the lightest cars of Porsche's current lineup.
The 911 GT3 RS has a 0-60 mph (97 km/h) acceleration rate of 3.2 seconds and a top speed of at least 196 mph (315 km/h).
The 911 GT3 RS (991), much like with the previous 911 GT3 RS 4.0 (997), launches off the line with very little wheelspin and revs up to at least 8800 rpm. Its rear-engine architecture along with its aerodynamic upgrades and racing tires give the GT3 RS notably sharp steering but also make it less forgiving than other drivetrain layouts due to a higher chance of oversteer. With a top speed of 212 mph (341 km/h), far above its claimed top speed of 196 mph (315 km/h), the 911 GT3 RS also performs decently in high-speed situations.
In Forza Horizon 3, the 911 GT3 RS is the only car that can not be purchased from the Autoshow for free upon downloading the Porsche Car Pack.
The 911 GT3 RS's engine, named the "4.0L F6" in-game, appears as an Engine Swap for various Porsche cars in Forza Horizon 3, particularly the Cayman GT4, 1995 911 GT2, and 911 Carrera RS. However, compared to the 911 GT3 RS 4.0's 4.0L F6 engine, it has a lower maximum output at 960 hp (716 kW) and 630 ft·lb (855 N·m).