Sounds like there is an intake leak after turbos. Have you checked all of the intake pipes to make sure one is not popped off? Are both MAF sensors still in place? Sounds like could’ve been an overboost condition.
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2006 Z4 M Roadster - Silver Grey Metallic
2011 X3 xDrive28i - Deep Sea Blue Metallic
2012 X5 M - Monte Carlo Blue Metallic
2017 X1 xDrive28i - Alpine White
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