it just doesn't make sense to put a high revving motor with a very late torque band into a heavy SUV, you need torque and because of this a 4.4 x5 will probably still outrun a s54 powered X5, meaning your huge investment is completely useless.

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2006 BMW X5 4.8is Lemans Blue/Beige/Dark Maple
-Nav, Comfort Seats, Heated Steering Wheel,
Rear Airbags, AUX Input
2009 BMW M3 Space Grey/Black/Carbon
-all options