EGR system components (Audi A6 C5)

2.0. Components of the EGR system:
1 - to the air filter
2 - low pressure hose
3 - low pressure hose of the boost air pressure reducing valve
4-vacuum booster brake drive
5 - vacuum receiver
6 - check valve
7 - vacuum pump
8 - to the valve drive in the intake manifold
9 - low pressure hose of the mechanical valve of the EGR system
10 - boost air pressure reducing valve
11 - EGR valve