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My 340i xdrive puts the power down fine without a rear diff. It's been in some snow/ice; not the heaviest, but surely several inches and uncleared back roads of Quebec. It had no issues with Blizzaks on. I think it'd be a different story if it were RWD. With the low rpm torque, it would need a diff just as much if not more than the e90 and e46 m3's.
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