I consider a Viper a Supercar. I also agree with seung. All exotics are not supercars, they are just exotic. Exotic to me just means that they are hard to come by and are probably made by hand, and have to be ordered, and are numbered, and have an enefficient engine (joke), etc.

 

http://www.shelbyamerican.com/series1/

 

The Series 1 has been available for some time. However lawsuits, EPA problems and other "distractions" have kept the car from being more widely recognized.

Is is a supercar? I don't think so. I think it was Motor Trend a few months back that compared the Series 1 wiht an orginal 427 Cobra and in damn near all the "benchmark" performance standards the nearly 40 year old 427 was better (braking being the one glaring difference, as I recall).