[2] A new transaxle was developed so that the rear wheels could be moved 76 mm (3 in) backward in relation to the position of the engine, which significantly improves the weight distribution and cornering performance of the car.

[citation needed] The 2016 model year also brought about the Rennsport Reunion Edition, limited to 25 cars, which featured a Fashion Grey livery and a 436 PS (321 kW; 430 hp) naturally aspirated 3.8-liter flat-six engine available exclusively with a manual transmission.

It also included 18-way power sports seats, PASM adaptive suspension, Bose audio system, rear parking sensors, carbon-fiber dashboard trim, 20-inch sport classic wheels, adaptive headlights (PDLS, or Porsche Dynamic Light System), and a host of decals for the hood, doors, roof, and decklid plus a key fob painted the same Fashion Gray as the car, and a special leather case for the key with “911 Carrera GTS Rennsport Reunion Edition” lettering.

[7] Notable changes from the standard GTS include 20" alloy wheels (the same as those found on the 2014 50th Anniversary Edition) which pays homage to the "Fuchs"-style wheels on classic 911s, special "Club Blau" exterior paint,[8] SportDesign bodywork, and a "ducktail"-style spoiler which references classic motorsports-oriented 911s, for example the Carrera RS 2.7.

Cosmetically, the 50th Anniversary Edition featured the wider body of the Carrera 4S,[13] 10 mm lower suspension,[14] special 20" alloy wheels which reference the iconic Fuchs wheels on classic 911s,[15] chrome trim across the body including the vents on the rear engine cover and window trim, standard SportDesign side mirrors, and a special "911 50" rear badge.

On 12 January 2015, Porsche announced the 911 Targa 4 GTS at the North American International Auto Show in Detroit.

Similar in appearance to the existing Targa 4 and 4S models, the GTS added the 430 PS (316 kW; 424 bhp) engine plus several otherwise optional features.

[20] The GT3 variant was added to the 991 line up at the 2013 Geneva Motor Show equipped with Porsche's new active rear wheel steering.

The 991 GT3 RS also comes with functions such as declutching by "paddle neutral" — comparable to pressing the clutch with a conventional manual gearbox – and a Pit Speed limiter button.

As with the 991 GT3, there is rear-axle steering and Porsche Torque Vectoring Plus system with fully variable rear axle differential lock.

Unveiled at the 2016 Geneva Motor Show on 1 March, the 911 R shares most of its underpinnings with the GT3 RS, but does not include the roll cage, rear wing, and associated bodywork for a weight saving of 50 kg (110 lb).

The 911 R comes only with a 6-speed manual transmission, and has a top speed of 323 km/h (201 mph) due to a lower drag coefficient as compared to the GT3 RS.

PDK = Porsche Doppelkupplung (Dual Clutch Transmission) SC = Sport Chrono Following an introduction at the 2015 Frankfurt Motor Show, the 991 received a mid-cycle facelift for the 2016 model year.

The Targa 4S includes an upgraded 3.0-litre twin-turbocharged flat-6 engine generating a maximum power output of 420 PS (309 kW; 414 hp) and 499 N⋅m (368 lb⋅ft) of torque.

The 2017 GT3 was unveiled at the 2017 Geneva Motor Show, and has a 4.0-litre flat-six engine, aerodynamic upgrades, and an optional 6-speed manual gearbox (absent on the 991.1-phase GT3).

[31] The 911 GT2 RS was officially launched by Porsche at the 2017 Goodwood Festival of Speed along with the introduction of the 911 Turbo S Exclusive Series.

Other changes include a large 1,909 mm (75.2 in) wide and 400 mm (15.7 in) deep rear wing, LED headlights mounted in the lower air intakes beneath the "flatnose" front body work, "turbine aero" wheels, the carbon-fibre racing steering wheel from the 911 GT3 R, adjustable wing mirrors from the 911 RSR, a full roll-cage in the interior, a racing bucket seat from RECARO with six-point racing harness, a lightweight lithium-ion battery, a 115-litre FIA FT3-approved safety fuel cell with fuel cut-off safety valve, a fire extinguisher and an air jack system.

The car retains ABS and Porsche Electronic Stability Management System including a full defeat mode.

[36][37] At the 2018 Paris Motor Show held in October on the occasion of the 70th anniversary celebration of the marque, Porsche unveiled the Speedster variant of the 991 generation for the 911, as a concept.

Utilising the chassis of the GT3 and the body shell of the Carrera 4 Cabriolet, the Speedster sports a 4.0-litre naturally aspirated flat-six engine with a maximum power output of 500 PS (368 kW; 493 hp) and a red-line of 9,000 rpm coupled with a 6-speed manual transmission, which is claimed to be 4 kg (9 lb) lighter than the 7-speed manual transmission found on the standard 991 models, and a titanium exhaust system.

The car also features the signature "hump" shaped double bubble roof cover along with a shorter windshield frame, side window glass and the analogue roof folding mechanism retaining the "Talbot" wing mirrors and the central fuel cap from the 911 Speedster concept unveiled earlier at the Goodwood Festival of Speed harking back to its use on the 356 Speedster.

Other highlights include a leather interior with perforated seats, red tinted daytime running lights, carbon fibre fenders, engine cover and hood and stone guards.