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Old 04-09-2012, 11:34 AM   #9
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Join Date: Apr 2012
Location: Fort Myers, FL
Posts: 213
My Ride: 2004 330ci
It appears to be the lower idler pulley that's attached to the supercharger mounting bracket. There appears to be some surface rust. I'm going to take it apart and clean/lube it to see if it helps.
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