The autobiography has a great interior that's for sure it has a drink cooler as well that would be handy but in the end I wanted the sportier feel the M gives. I would drive them both back to back and see which you enjoy more I don't think there is a wrong choice with those two vehicles.

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X5M Eisenmann exhaust, de-Catted down pipes, 22" HRE wheels, ECUProgram stage II (700hp) tune
X5 35d Tuned and Lowered