I've done 130 in 3.0 and there is no need to go faster than that, plus it takes like 10 miles to get up that high, a 4.4 is drag limited to about 145, so with 100 less HP you may get 5 mph more going down-hill

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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