I've tested mine a few times, I agree they are unbelievable, whenever I let my friends drive the X, they are floored at how fast it stops. I think one of the original tests of it says that it actually stops faster than a cls55

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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