It is either the exhaust or the noise from the direct injection (same noise had my MCS and very similar is the 116i)...I think you don't have to worry, it sounds normal to me.
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2011- : BMW 116i (F20)
2009-11: BMW Z4 2.5si (E85)
2007-09: Mini Cooper S (R56)
2005-07: BMW 325ti (E46)
2004-05: BMW 318i (E36)
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