[lukasbmw]

Well,

-The puff of heavy white smoke

-Wastegate rattle

-The intermittent "half engine" light (came on once a week and went away when I cycled the engine

All seem to be related. BMW NA replaced my turbo's and vacuum lines under warranty.

I no longer smell burning oil, have any smoke, or get any check engine lights. And the biggest difference is my car actually sounds like a turbo car. No more rattle/buzz from the turbos when I slow down. Instead, you can hear the turbos spool up and slow down.