WARNING: This page is about a different car, the 2004 Audi S4, 2004 Audi A4, 2003 Audi A4, and 2002 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
Bumper removed.
Remove combination bolts -2-.
Remove nut -3- and pull impact absorber -1- out of crossmember.
When installing tighten combination bolts -2- to 50 Nm and hex nut -3- to 4 Nm.
Fig 1: Removing Impact Absorber Out Of Crossmember