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Here is my vehicle info, now show me what you think it should look like and the Subaru part number applicable for my vehicle:

Vin: JF1GD29645G506196

2005 Subaru Impreza (205) 5MT 4WD WRX Sedan
There should be the vacuum hose from the intake to the boost controller that plugs into that connector via wires.

What you have is a vacuum hose that dead ends into open air and no boost controller.
 

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From what I can follow from the fsm both of those connectors should be populated as well on the non STI engine. It looks like it's part of the boost control system but Subarus electrical diagrams and detail is horrible.
 
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