problematic Boost leak

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I noticed that i wasnt building as much boost as i usually was, so I did a boost leak test and I have a huge leak from what sounds like behind my engine. I have felt around but i cant feel where it is comming out of. Do you guys have any ideas on what i should check?

 

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i have been using soapy water and i have also lifted the car to look under. i think that it might be the intake manifold gasket. and i dont know how i can get soapy water up in there. I have also tryed the throttle body and sprayed around there.