Neat car, however don't expect to be able to buy one, or even see one going dwn any American highway, or even the Autobahn in Germany for that matter? The fact that the equiped the race car with fenders and lights does not make the vehicle street legal.
It certainly is not highway legal in any US state and not legal in most European countries: 4 wheel vehicles require windshields, wipers, front and rear bumpers, mufflers,...and lets not forget pollution controls like catalytic converters, EGR and air bags if produced after 1992.
It does clearly demonstrate that a small displacement turbocharged engine in a very lightweight car can provide outstanding performance and exceptional gas mileage.
...Rich