First version of the Audi Quattro S1 that Walter Röhrl drove at the Monte in 1986.
Simply unpack and copy the aqe.nefs to folder:
SteamApps > common > DiRT 4 > cars
Remember to backup the original file - you're using this mod at your own risk.
Audi Quattro S1 E2 - Rally Monte Carlo 1986 1.0
Dirt 4 mod for the Audi Quattro S1 E2