Check the charged air pipe from turbo all the way to the intercooler and on to the inlet manifold.
Look for splits / cracks / hose clamps having fallen off etc.
Check also the intercooler for leaks
The best way to do a leak test is with a smoke test machine.
But the poor mans way is a second person revving the engine while you look under and around the motor following the charged air pipe and looking / feeling for air leaks.
Watch your hands around moving parts!
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XC90 R-Design MY2009, Black Sapphire Metallic. HP-Sound, RSE, Nav, Tel, ParkingCam, BLIS, ParkingHeater, RestHeat, Removable Towbar, Summer: CRATUS 20x8 on Pirelli Scorpion Zeros 255/45, Winter: NEPTUNE 17x7 on Continental WinterContact 4x4 235/65.
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