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For 1989, Porsche produced the 25th Anniversary Special Edition model to mark the 25th year of 911 production. The 1989 Porsche brochure lists production of 500 U.S. market cars, of which 300 were coupés (240 in silver metallic paint and 60 in satin black metallic), and 200 cabriolet models (160 in silver and 40 in black). All had "silk grey" leather with black accent piping and silk grey velour carpeting. Includes small bronze "25th Anniversary Special Edition" badges.
Porsche will only build 30 examples of the Clubsport 25. Mechanically, it's similar to the regular GT2 RS Clubsport. It makes the 691 horsepower from a twin-turbocharged 3.8-liter flat-six. But it gets many, many changes to the exterior and even the cooling system. As you can clearly see, the body has been lengthened, and it has also been widened. The latter is necessary to house the wide, low-offset 18-inch wheels taken from the Porsche 935, though without the aerodynamic covers.
After introducing the Porsche Carrera S with the body carried-over from the Turbo version, customers asked about an all-wheel-drive version for it. The 993 Carrera 4S was sold between 1995 to 1998. Much like the 993 Carrera S, the 993 Carrera 4S takes the 993 Carrera 4 powertrain and fits it into the widebody 993 Turbo shell, sporting 18" alloy wheels. The engine was the same 3.6-liter naturally aspirated, but it was offered in the higher power output of 285 hp. As with the Carrera 4, it was only available with a 6-speed manual transmission. The 4S did not have a cabriolet version.
Porsche makes sports car history by launching its first publicly available rally car, the $223,450 911 Dakar. After extensive testing, Porsche has settled on a 3.0-liter twin-turbo six-cylinder boxer engine with 473 hp and 420 lb-ft of torque and an 8-speed PDK. True to rally form, an 80-mm suspension lifts the car, along with an optional roof rack and model-specific Pirelli Scorpion all-terrain tires.
The Carrera 4 Cabriolet was released with the rest of the 4 and 4S models as 2006 model year cars. With a sure-footed, four-wheel drive powertrain as well as that "wide-body" stance, and with tops that open or close at the touch of a button, the Carrera 4 Cabriolet really started to make the case it could do it all. The wide look gave the 4 a widened track, larger wheels and tires and four-wheel-drive powertrain that gives more dynamic stability, especially in inclement weather conditions. Developed at the same time as the coupe.
Southern California Porsche dealer Johnny von Neumann knew what his customers wanted, and a Targa top Targa 911 wasn’t it. With Porsche’s approval, he hired designer Nuccio Bertone to create a one-off 1966 Porsche 911 Spyder, in hopes of launching low-volume production. Just one example was constructed.  The engine incorporated a vertically-mounted cooling fan, a 9.1:1 compression ratio and two triple-choke 40PI Solex carburettors. Peak output was 130bhp at 6100rpm and 174lb-ft at 4200rpm. Transmission was via a Type 901 five-speed gearbox and single-plate clutch.
The 911T Coupe and Targa continued as the entry level 911 for 1972 and 1973. As with the higher-end E and S variants, Porsche upgraded the 911T to a new, larger 2.3 L engine, commonly known as the "2.4 L" engine. With the power and torque increase, the 2.4-liter cars also got the newer and stronger transmission. Non-US versions (ROW), were carbureted and featured the Type 911/57 engine, rated at 130 hp. US-spec 911T's had engine Type 911/51 and were rated at 140 hp.
As the rules do not permit higher output engines, the engine for the 991 RSR was taken from the 997 GT3 RSR 4.0 and the development work focused on the chassis, body, aerodynamics and the gearbox. A wishbone front suspension replaced the McPherson struts used in 997. A new development was the lightweight gearbox. One of the priorities in the development was the more evenly balanced weight distribution. The centre of gravity was lower, too.