Not sure that anyone cares at this point, but once the turbo came out it was clear that the WG was sticking in the open position. Not locked, but sticking pretty good every few swings. That seems to fit with the symptoms...
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2013 535xi M Sport (PWG) // PS2 // Spool fx150 // MHD // xHP // FTP Inlet // FBO: AR HF DP, Wagner IC, BMS Intake, VRSF CP
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