OK! 959 Time
The 1984-88 959, with only 30 US version ever made, and only 2 of those legal in the US. Bill Gates happens to own 4 of the illegal ones.
0-60 in 3.5
450Hp out of a 2.8L Flat six w/sequential turbos
13mpg
10 years ahead of its time, the most sought after Porsche ever made, bar none, and the fastest production Exotice for the next 5 years (beaten only by the 93 RUF CTR 4 "YellowBird")
Check it out:
http://erntheburn.tripod.com/autos/959/95913.htm