It's always a bit nostalgic remembering the racing cars of the 80s and 90s, besides being pleasant to discover the stories behind the details that made a car an innovation and a winner.
In the video below you can see the driver Hans-Joachim Stuck tell us details about the race held on September 17, 1989 at the Sears Point track (IMSA/GTO) in the USA. The Audi 90 had a 5-cylinder engine with over 700hp, and used together with the quattro system managed to beat other vehicles with bigger and more powerful engines, but also heavier.