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Subtle pulsing sound

(2009 BMW 328i xDrive)
in Claremont, NH on March 08, 2013
My 328ix has the sound like a pulse going down the road around 40-60 mph. Not a thump thump sort of thing, but a louder hum ever couple seconds consistently? Where do I start? brand new Michelins with less than 200 miles. alignment, or x-drive issue possibly? thank you.
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