Auto Union Race Cars (Video) 1 discussions On sept. 11th 2004 audi came back to their roots. Back to the place of birth of the legendary Auto Union racecars. To a city called Zwickau. So i had the chance to film these beautiful cars which were.. Tags: auto union zwickau audi ingolstadt rennwagen racecar tradition history formel1 formula one silberpfeil auditag