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      02-04-2013, 02:41 PM   #5
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Drives: The best kind of F30 :)
Join Date: Aug 2012
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If it is turbo noise, this is very random. The 330D I test drove had a very 'vocal' turbo, and so too it seems the test car Autocar drove. Yet my 330D turbo is totally silent from the cabin. You might just have a more 'vocal' turbo....nothing wrong with it.

Keep an eye on it, if it gets louder then worry.