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The power steering on the e90's is hydraulic, and there is no pulley on the water pump since the pump IS electric. Belts don't just come off for no reason although I've never seen one do this on an E90. There was some reason the belt came off, either one of the belt driven accessories locked up, the tensioner pulley failed, or a drive pulley on one of the accessories failed.
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10 AW on fox E90 M3 with 2 pedals, gentleman’s ride
08 AW on fox E92 M3 also 2 pedals, a bit more rowdy
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