Egr/sai question
 

2002 A6 2.7t
What system is the combi valve in the EGR or SAI?
I am thinking about a tune and have the option to delete the EGR from the ECU. If the SAI system uses the same ports as the EGR I was thinking delete the SAI from the ECU and remove the hoses, valves ect....for both systems from the engine. I have seen EGR and SAI block off plates and they look the same.
Thanks for the help.