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I'm just throwing out some thoughts, but... I'm not sure how well this type of "upgrade" will sit with the owners of X5 M's being that they already shelled out lots of money to get the "M" version, only to find out that BMW M didn't already bring out the motor's full potential as-is. Now, you have to get a performance pack or something to get the most out of the motor/transmission? I wouldn't be happy.
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