Originally Posted by
m8internet
Sounds like either a pre-turbine or air/boost leak
However, the big clue is that the noise continues after you have switched the engine off
This almost certainly points to a air/boost leak
Have someone sit in the drivers seat, that can hold steady revs
With the engine running at just under 1500rpm
Feel over the engine bay for any unusual air jets
There shouldn't be any
However, lifting the engine revs to about 2000rpm should be enough to activate the turbo, which you should be able to hear
Again, feel over the engine bay for any unusual air jets
Switch the engine off, then repeat
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