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*update*
-raised each front corner, spun wheels, sound good
-took each front tire off, spun just the rotor and looked both sides, good
-measured each front rotor, maximum wear is 0.5mm on front left, which is <2mm recommended replacement
-retorqued all wheels, good
-drove around, still making the sound
-had a friend of mine sit in car with me (370z dude) and he thinks its coming from the rear and after careful listening, i am of this opinion
-he thinks its the diff....which would fit with why this happens when car is turning and why its coming from rear. it makes sense. i agree
any opinions before i go to BMW?
thx all for your help
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