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The 964 Carrera RS 3.8 was produced as a base for homologation for the venerable 3.8 RSR. It was unveiled in 1993 and produced in a very small series by Porsche’s Racing Department in Weissach-Flacht, and was an extreme evolution of the 964 Carrera RS that was released two years prior. It featured the wide-body look of the Type 964 Turbo, a massive rear spoiler, and three-piece “Speedline for Porsche” wheels with 235/40 and 285/35 tires, making it distinctively more aggressive in appearance than the fairly restrained styling of the Carrera RS of 1992 and capable of providing significantly more mechanical grip.
The Porsche factory had 93 Turbo chassis left. These were all transferred to Porsche Exclusiv and hand built as the very special 964 Turbo 3.6 S. They were offered with normal, or ‘Flachbau’ slant nose front ends. While the vast majority of Turbo S’ were fitted with the ‘Flachbau’ nose as a no-cost option, the Turbo S could also be had with the traditional 964 nose as well. In all, 76 Flatnose cars were made while 17 non-Flatnose (known as Package option) cars were made. These cars were also fitted with the X88 option, which increased power to 380 hp. 75 flatnose units were produced.
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.
Stuttgart. Porsche is celebrating the 25th birthday of its roadster family with a special anniversary model: the Boxster 25 Years. The limited edition is restricted to 1,250 units worldwide and is based on the GTS 4.0 model, which is powered by a 4.0-litre six-cylinder boxer engine with 294 kW (400 PS). It makes reference to numerous design features of the Boxster concept car that heralded the success story of the open-top two-seater at the 1993 Detroit Motor Show. The production version was launched in 1996 with hardly any changes in its visual appearance and is now in its fourth generation.
The 2021 Cayman GTS 4.0 is the perfect car. The old GTS used a 2.5-liter turbocharged flat-4, and while it was a perfectly strong engine with lots of low-end torque, it lacked the personality and linear power delivery of a free-breathing flat-six. It didn't sound half as good, either. The GTS 4.0 was built to offer more performance and more grunt as well as a more aggressive design and all the good options included as standard. The new 4.0-liter engine is borrowed from the 718 Spyder and Cayman GT4, detuned to produce 394 horsepower and 309 pound-feet of torque. A 6-speed manual is standard.
For testing purposes Porsche Motorsport built a few tarmac rally cars based on the Cayman 981 GT4 racing version. The Cayman rally car was the course car for the WRC (World Rally Championship) 2018 ADAC Rallye Deutschland. The FIA R-GT Cup was contested on tarmac rounds of the ERC and WRC, like the German WRC event. For Porsche, the entry of a concept study based on the near-production GT circuit race car was a critical test under real conditions.
Porsche Cayman GT4 Clubsport (2015 - 2016)
In 2015, Porsche announced the car we all thought Porsche would never build. It has been a few years since it has been released and the excitement It was the first time Porsche introduced lets the motorsports guys in Weissach sprinkle their magic on a Cayman. With components sourced from the 911 GT3, an engine carried over from a Carrera S and a tweaked and tuned chassis, brakes and aerodynamics, Porsche’s engineers did their best to produce the perfect mid-engine sports car for road and track use.
The Limited Edition Cayman S Black combines many of the high performance benefits found only in the 2012 Cayman R with many other desirable options off the list, options that when combined create a distinct personality for this special car. After the R hit the scene, many potential buyers complained of the inability to order one with many of the highly desirable street options, particularly PASM. The Cayman S Black Edition gets the 330 BHP engine found in the R but without all of the other performance focus.
On November 17th - 2010, Porsche CEO Matthias Mueller unveiled the 2012 Cayman R to an excited audience at the Los Angeles International Auto Show. Porsche pretty much threw the kitchen sink at this one, applying all they know and have available without actually redesigning the car. Every performance option on the list, and then some that weren't on the list have found their way into the Cayman R. A weight savings of 121 lbs. (55 kg) was achieved and it transformed the Cayman. We are going out on a limb here, but we think the Cayman R may be one of the best Porsche cars ever made.
In late 2008, Porsche introduced the limited edition Cayman S Sport. The Sport was a Cayman S packaged with many sport options to create an edgy/sporty Cayman S. Beyond sport options, the Cayman S Sport received new DME software maps created to work with the Porsche Sport Exhaust and a unique Twin Chamber Dual Output Tailpipe that supply the Cayman S Sport with 303 horsepower at 6,250 RPM, making it the first Cayman to break the 300 horsepower ceiling.
In the middle of 2008, Porsche introduced the limited edition Cayman Design Edition 1. The Design Edition 1, also know as the DE1, was a Cayman S packaged with many exclusive cosmetic options intended to commemorate the 35th anniversary of Porsche Design. This car was clearly designed for the Porsche enthusiasts who wanted to own a very special Cayman. Buyers of the DE1 received a special briefcase that contained some pretty cool Porsche Design merchandise, including a Design Edition Chronograph Wrist Watch, Sun Glasses, Ballpoint Pen, Pocket Knife, Key Chain and the key to the DE1.
Essentially a liaison Boxster version situated between the 718 Boxster GTS and the hardcore 718 Spyder, the Porsche 718 Boxster GTS 4.0 offers a mix between the comfort and features found on the regular GTS and a detuned version of the engine found in the Spyder. Alongside its hardtop Cayman sibling, it is also one of the last production sports cars with a large displacement engine that doesn't feature turbocharging or supercharging. It produces 395 bhp @ 7800 rpm and 310 ft lbs @ 5000 rpm and can hit zero to 60 mph in 4.3 seconds (only 0.1 seconds slower than the Spyder).
The mid-engine roadster is powered by the 2.7 liter flat-six engine with 265 hp. Its color concept remains consistent with the soft top and supplemental safety bar which are both finished in black. The wind deflector reduces undesirable turbulence when the soft top is down. 20-inch Carrera Classic wheels and the Bi-Xenon™ headlights with Porsche Dynamic Light System (PDLS) set distinctive highlights, while standard two-zone air conditioning and heated seats provide a higher level of comfort for both driver and passenger. The Porsche Communication Management system is included as standard.