View Single Post
      11-14-2012, 10:20 AM   #4
mocohead
Lieutenant
mocohead's Avatar
19
Rep
450
Posts

Drives: '16 M235i 6MT & 12 128i Msport
Join Date: Sep 2010
Location: CA

iTrader: (0)

I believe that is the vacuum operated wastegate. When vacuum is applied, it opens the flap on the turbo to release boost.