Only four were ever built.  One in 1992 and three in 1993:

Number 1 - WPOZZZ96ZNS820065 - Red
Number 2 - WPOZZZ96ZPS896061 - Yellow
Number 3 - WPOZZZ96ZPS896062 - Black
Number 4 - WPOZZZ96ZPS896063 - White
  Number 2
  Number 3
  Number 4
  Number 1
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General Information

In 1992, Porsche introduced the 968 Turbo RS racecar which it developed to compete in the new ADAC GT racing series in Germany. The car was based on the 968 coupe with limited lightening due to the regulations of the series which had a 4kg/bhp power/weight ratio limit.

The car featured a K27 turbo boosting the 3.0 litre, 4 cylinder engine and an 8V head, similar to the 944 Turbo S, rather than using the 16V 968 head.
Factory Specifications

Engine
Bore
Stroke
Valves
Horsepower
Horsepower
Torque
Fuel
Wheels (F)
Wheels (R)
Tires (F)
Tires (R)
Transmission
Weight
Rollcage
0-100 (62mph)
Base price
Contact me:
Links:
 
968.net
NineSixtyEight.com
Porsche Club of America
Porsche
968 Turbo
968 Turbo RS #2
RSBarn.com
3.0 litre, 4 cylinder, turbo
104 mm
88 mm
8v (2 / Cylinder)
337 @ 5400 (ADAC GT)
350 @ 5400 (Le Mans)
369  lb ft (500 nm) @ 3000
98 Octane
10J x 18"  
11J x 18"
265/630 slicks
305/650 slicks
6 Speed rear differential
2976 lbs (1350 kg)
Matter
4.4 seconds
228,000 dm
The ultimate 968 web site!
Another 968 web site
World's largest and best Porsche Club
Official factory info on the 968 Turbo RS
Konstantin's 968 Turbo site
Konstantin's photo page of 968 Turbo RS #2
RS Barn
Spin (2.5 Meg)
Spin (2.5 Meg)
Mutlimedia

Following is a video (.avi) file that you might enjoy!
 Non-Factory
Wallpaper
Porsche 968 Turbo RS that you can drive in Need For Speed.