An interview with Momi about his X1/9. http://www.network54.com/Forum/12159/message/1219205321/An+interview%2C+a+car+and+it%27s+man++%26lt%3BGENERAL+WARNING%26gt%3B
He states what are the most important aspect of any performance car, the chassis and brakes. There is no solid foundation for a performance car if the chassis and brakes are poor to begin with. One can always add power. Like the Wright Brothers who figured how to make powered flight happen, it was pretty much a problem of control, not power. This is a very basic item many car folks don't appreciate or understand well which I suspect is why most car folks focus on the engine and looks then forget the rest.
And, a video of what a "cheap heap FIAT/Bertone x1/9" is capable of doing when this chassis is allowed to be what it could be: http://video.google.com:80/videoplay?docid=4039536226454557146&q=ISRAEL%27S+FASTEST