its also to keep Oil and other Particles away from the insuction...
Sommer: 1992er Audi 100 typ C4 mit 2,5L Motor - Der Einzigartige Winter: 1991er Audi 100 typ C4 mit AAR Motor Frau: 1993er Audi 100 Avant mit 2,5er AAR Motor und MPI
These parts of the crankcase ventilation have changed a couple of times. It may be that due to these changes this part may not fit.
I have removed mine several years ago (accidently) as it was not mentioned in the service manual (Reparaturleitfaden) and I thought that it was installed by the previous owner. Hence, I cannot check with my car... I just remember that even for the new MPI pipes partly have changed as the original ones had the tendency to dissolve (rubber instead of hard-plastics). Somebody in here will know more precisely...