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So you remove intercooler... tape up both ends... put it in a tub of water.. then preasurise it using either a bike pump or in my case an air gun making sure to only feather the trigger... then look for bubbles... if its hrd to push dwn into the water and wants to float or u cant see any visible bubbles its good.. or in my case if it bubbles and gets heavy frn water getn inside then shes leaking..lol..
When testing i usually dip the flush taped end dwn into the water first and preasure the bent end up the top that way ur not putting the sensor into the water...