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      11-09-2018, 04:47 PM   #6
nontoxic
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Drives: 2009 Z4 35i
Join Date: Nov 2018
Location: Texas

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It's unlikely to go from rattle to failure right away. From my understanding, the waste gate control arm loosens up, failing seal properly at low rpms. The rattle will get worse over time and it will fail eventually.

I drove on it for 6 months+ with the jb4 fix with minimal noise. Look into MHD waste gate fix also since it will be lot cheaper.
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