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rasping or buzzing noise coming from new m135i
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05-26-2013, 11:44 PM
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Bruno28
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Drives: 125i F20 M-Sport
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From what i know, the flap is just to reduce sound or drone. Some people remove it so its a bit lounder during the engine rev.
There is no harm in doing it, and certainly dont think it affects emissions.
Appreciate
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