ALL AUTOCARS

"It has always been a dream of mine," Roland Gumpert declares on his website, "to have a car that has so much downforce, such aerodynamic efficiency that you could drive on the roof of a tunnel at high speed--and this car can." We have to believe him, because Gumpert is the ex-competitions chief of Audi's Quattro division, and helped lead the four rings to the victories that got the Coupe Quattro