Flash Gordon

I plan to use CRC intake valve cleaner to clean the intake valves due to direct injection system of E400. CRC specifies to spray into the throttle body to get to the intake valves. I can either spray into the air intake or, preferably, into the vacuum port to get to the intake valves. I had a very thorough look at my E400 engine but not sure where to spray. I disconnected the air filters and tried to see the throttle body, but unable to see it. And I am not sure where is the vacuum port either.

Please show locations picture where to spray to get to the intake valves. Many thanks!