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It strange u guys don't have it because I saw another 535i pic with the installion with exact same cover on his diffuser.
As for droning, it"s very faint at low rpm but I have to do some comparison with others who has SS to be sure. I know Tinybeammer has a SS. Have to check on his one day.
Last edited by st8800; 11-20-2011 at 12:08 AM..
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