The GB200 is an icon of that golden age of sports car design: a mid-engine, four-wheel drive rocket built with the power of a modern supercar and the handling, brakes and safety features of an angry dog. You can play it cool all you like: no matter how many times you take it over 100, the moment the turbo kicks in will have you clenching so hard you won't know if that was an ecstatic climax or a…