I never experienced this issue on my 4.6iS but it did happen to my M62 powered 540i. It is a thing, TB failures are a "known issue" with these engines. Hell it even happened to Jeremy Clarkson in the Nile Special. May have been scripted may not, we'll never know.

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Again Daily Driven SC'd 4.6iS, whats the point of having a sweet ride if you dont use it all the time.