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The 964 based Speedster was the 1994 Speedster which was based on the 964 Carrera 2 platform. There are far fewer 1994 911 Speedsters in the world than the 1989 model, with production reportedly totaled only around 936 units, less than half as many as the 1989 example. Whereas the 1989 Speedster was primarily an aesthetic package, the 964 version sought a happy medium between the regular Carrera 2 and the hardcore Carrera RS. It had the same engine as the base Carrera and didn’t have the same suspension bits as the RS.
The original 1973 Carrera RS was available in Europe but not in the USA. Porsche decided to build the 1993 Carrera RS both to European spec and a limited number in compliance with US regulations. These US spec cars were assigned the name “RS America”. The intent was to create a basic lightweight, no frills 911 with minimal luxury options. The standard US Carrera 2 brakes, engine and gearbox were used. The RS weighed 2,945 pounds so it was almost 80 pounds lighter than a standard Carrera 2. 
The Turbo-look Porsche 964 has always been a very desirable automobile, among them 1,532 Carrera 2 Cabriolets constructed worldwide. Within that group, there were some cars that were even more specialized. The Register says six Turbo-look cabriolets were pulled off the production line in Zuffenhausen and transported to the Porsche Exclusive shop in Weissach. Three of these six powerful and luxuriously equipped drop-tops were equipped with left-hand drive for buyers in Germany (Code C00), and the other three were fitted with right-hand drive
Porsche 911 Turbo S2 (964) (1992)
A forgotten part of the 964s history is the Turbo S2. It was built to adhere to homologation rules so Porsche could participate in IMSA's sports car racing series. IMSA's homologation rules meant that Porsche had to build at least 200 road-going versions of the participating car, 20 of which needed to share most of the primary components of the race car. The 911 Turbo S2 was built specifically for this purpose and exclusively for the United States and Canada. The 20 homologation specials left the factory as stock 964 Turbos, heading immediately to California-based tuner for "S2" engine upgrades.
Porsche 911 America Roadster (964) (1992 - 1993)
The American Roadster is essentially a turbo-bodied Carrera Cabriolet with Turbo suspension and brakes. Like the 356 America Roadster it was named after, the Type 964 America Roadster was a limited-edition, driver-focused convertible destined for the American market. Production for the America Roadster was limited at only 250 examples, and the model was only produced in 1992 and 1993. Its engine was a standard unit making 250 horsepower, but the special edition had the wide fender flares, suspension, brakes, and 17-inch Porsche Cup wheels of the 911 Turbo.
The 2022 Porsche Targa 4 GTS adds more grunt, packs less weight, has sharper handling, and packages it up in the sexiest bodystyle that Porsche sells. The Targa 4 GTS gives us the best of all worlds, providing all-wheel-drive traction, an open-top experience, and a fixed-roof feeling in the same car. Its automatic transmission and adaptive suspension completed the image of a daily-driver sports car. This may be the perfect car.
Porsche has also decided to gift the GTS a more distinct and dynamic personality that can’t be duplicated via the Carrera S’s options list (even if you could get the engine, which you cannot). The downside is that the price has gone up too and ticking a few more options boxes can get the Carrera 4 GTS Cabriolet into 911 Turbo territory price-wise. In the engine department, the 3-litre twin turbo flat six develop 473 bhp and 420 ft lbs.
The engine is the same 3.0-litre, twin-turbocharged flat-six petrol engine as in the 911 Carrera S, but it has been fettled to produce 473 bhp. The GTS also has a bespoke suspension set-up that sits 10mm lower than the standard 911, and that's true no matter whether you choose two- or four-wheel drive. Most of the time, there's absolutely no difference between the standard GTS and the all-wheel-drive version. But when you need it, the AWD Carrera 4 GTS will save you.
The 2022 Porsche 911 Carrera GTS Cabriolet arrives with 473 horsepower and 420 ft lbs of torque. Porsche's ultimate Carrera cabriolet model is brilliant, and flexible. Sure, you can go faster in a 992 911 Turbo, but we guarantee it won't be as much fun or as engaging as the GTS Cabriolet. This is just a great car, an all-round sports car that combines effortless performance with open top fun. It gets a 3.0-liter twin-turbocharged flat-six engine producing 473 horsepower.
The reality was that in the past you could basically build your own GTS. In the past, Porsche offered an optional factory "power kit" for 911 Carreras, but things are different now. That isn't an option for the 992. The 992 Porsche 911 Carrera GTS is therefore your only pass for accessing a version of the 3.0-liter twin-turbo flat-six tuned up to 473 hp and 420 ft lbs of torque. Those figures are achieved via an approximately 14.5 percent increase in turbo boost pressure.