[7] before French automobile manufacturer Peugeot protested, claiming it held exclusive rights in France to car names formed by three numbers with a zero in the middle.

[10] Erwin Komenda, who led the development project on T6 body, which replaced the T5 in 1962, was also instrumental in merging the T7 style with new engine, steering, transaxle and suspension.

In August 1967, the A series went into production with dual brake circuits and widened (5.5J-15) wheels still fitted with Pirelli Cinturato tyres,[11] and the previously standard gasoline-burning heater became optional.

The 911R with 901/22 engine had a limited production (20 in all), as this was a lightweight racing version with thin fiberglass reinforced plastic doors, a magnesium crankcase, twin overhead camshafts, and a power output of 210 PS (154 kW; 207 hp).

For the 1974 IROC Championship (which started in December 1973), 1973 Carrera RSR models were fitted with the 3.0 engine and a flat "whale tail" in place of the ducktail spoiler along with wide body panels and large tyres.

Private teams went on to win many races, like Le Mans in 1979, and continued to compete successfully with the car well into the 1980s until the FIA and IMSA rules were changed.

Changes in the fuel map and chip programming from October 1986 further improved the power to 217 hp (162 kW; 220 PS) (at 5,900 rpm) for North American delivered cars as well as for other markets mandating low emissions, like Germany.

Later on in that year, a 911 Club Sport Row (Rest Of World) with the identification number WP0ZZZ91ZFS101166 was special ordered for a Porsche driver that was particularly inspired by the CS prototype on the track.

[citation needed] In 1988, Porsche produced 875 examples of the CE or Commemorative Edition 911 Carrera in coupe, targa and cabriolet variants to mark the production of the 250,000th 911.

Distinguishing features include special diamond blue metallic paint with colour-matched Fuchs wheels, front and rear spoilers, and interior carpets and leather.

Included were body colour Fuchs wheels in 6x16 (front) and 8x16 (rear), stitched leather console with an outside temperature gauge and a CD or cassette holder, a limited-slip differential, and a short shifting gear lever, as well as small bronze "25th Anniversary Special Edition" badges.

The RS 3.8 of 1993 had Turbo-style bodywork, a larger fixed whale tail in place of the electronically operated rear spoiler, and a 300 PS (220 kW; 300 hp) 3,746 cc (3.7 L) engine.

Since the RS/RS America was intended as a no-compromise, higher performance version of the 964, there were four factory options available: a limited-slip differential, AM/FM cassette stereo, air conditioning, and a sunroof.

Car & Driver noted, "Porsche's version of the Goldilocks tale is the 993-generation 911, the one many Porschephiles agree that the company got just right," with an "ideal blend of technology and classic 911 air-cooled heritage.

The car's top speed was measured at 322 km/h (200 mph) The 993 turbo had parallel turbochargers, 3.6 litres of displacement, and a viscous coupling for the centre differential in the AWD drivetrain.

Engine displacement was 3.4 L and power output was 300 PS (221 kW; 296 hp) featuring a change to an "integrated dry sump" design and variable valve timing.

The 997 received a larger air intake in the front bumper, new headlights, new rear taillights, new clean-sheet design direct fuel injection engines, and the introduction of a dual-clutch gearbox called PDK for the 2009 model year.

According to Porsche, redirecting torque to control oversteer or understeer results in neutral handling as well as greatly improved performance in all weather conditions.

As with the 996 Turbo, the car featured distinctive styling cues over the Carrera models including front LED driving/parking/indicator lights mounted on a horizontal bar across the air intakes.

[citation needed] The 911 GT3 RS was announced in early 2006 as a homologation version of the GT3 RSR racing car for competition events like Sebring and the 24 Hours of Le Mans.

[43] In April 2011, Porsche announced the third generation of the 997 GT3 RS with an enlarged 4.0-litre engine having a power output of 500 PS (368 kW; 493 hp), Porsche designed the GT3 RS 4.0 using lightweight components such as bucket seats, carbon-fibre bonnet and front wings, and poly carbonate plastic rear windows for weight reduction, while using suspension components from the racing version.

This makes it the first street-legal 911 to exceed 322 km/h (200 mph) barrier, with the exception of the 1998 911 GT1 road car (which is broadly considered not to be a true 911 due to its mid-mounted engine).

It includes 6-speed manual transmission, double-dome roof, 44 mm (1.7 in) wider rear fenders, SportDesign front apron with a spoiler lip and a fixed 'duck tail' rear wing (similar to the one found on the 1973 Carrera RS 2.7), PCCB Porsche Ceramic Composite Brakes, 20 mm (0.8 in) lower PASM sports suspension, mechanical rear axle differential, 19-inch black Fuchs wheels, Porsche Exclusive woven leather seats and door panels, dashboard with Espresso Nature natural leather upholstery, and a specially developed Sport Classic Grey body colour.

The 4 and 4S models are equipped with an all-new variable all-wheel-drive system that sends power to the front wheels only when needed, giving the driver a sense of being in a rear-wheel-drive 911.

[57] The 991 GT3 features a new 3.8 litre direct fuel injection (DFI) flat-six engine developing 475 PS (349 kW; 469 hp) at 8,250 rpm, a Porsche Doppelkupplung (PDK) double-clutch gearbox and 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.

A Weissach package was available that included additional carbon fibre body and interior parts as well as magnesium wheels and stiffer suspension settings is available as an option.

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

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.