Quote:
Originally Posted by mocohead
I believe that is the vacuum operated wastegate. When vacuum is applied, it opens the flap on the turbo to release boost.
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You've got it.
My car has an N26, so this is electro-mechanical rather than vaccuum operated, but on the standard N20, BMW uses a pretty run of the mill twin scroll turbo w/vacuum-operated internal wastegate; only difference is the operation between N20/26.