I would get one with the nav pack because its allways better having the standard nav rather than some crappy fitting aftermarket nav. If you are a big man the sport seats will hurt your sides because they stick into you. I would get the nav kit and add some wheels and some better suspension if you would like.

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2007 E70 X5 3.0D Black/Beige - SOLD
2012 E70 X5 40D Silver/Black