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If you follow the skinny one on the right, it should take you to the oil fill. It's the one labeled "A" in the colored vacuum diagram. It's also the only one not colored in in the diagram. But yes, you are correct. It goes to the turbo inlet. Looking at the diagram, if you look at the primary turbo inlet there are 2 pipes coming off of it. One is blue and the other is not colored. It looks like it goes to no where. That's the skinny pipe you have circled.