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I dont think thats a good way to do a boost leak.
Becuase that hose goes to the intake manifold, from there the pressure is going to escape through the throttle body, through the pipes, through the intercooler and to the turbo, but then its going to just escape out the turbo intake..
When i do boost leak checks i have a home made tester, it fits on intercooler piping and it uses a pressure gauge and small valve, i put it in place of the turbo outlet.. (the pipe that goes to the intercooler) and then i pressurize that, the pressure this way will go through the pipes, through the IC through the TB and into the cylinders (if intake valves are open, if not it will stop here.) and then since the pressure cant get out the valves (one set or another) you will begin to build pressure, i pressurize it to 5psi and see if it holds it or slowly decreases indicating a boost leak..
but i could be wrong..
my money is on boost leak from your BOV
what are your ARF's doing when it cuts out?
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