I think you had a prblem with the adaptive tranny in that one. My 4.8is is a freaking rocket for a truck- my other cars are a Porsche GT3 with over 400 hp and my wifes 335i twin turbo and the truck is amazing for something that big. I drive the 4.8is like I stole it and use the manumatic as much as possible so it knows I like spirited driving. I drove a 4.6 at the dealer and it wasnt even in the same league. you also said it was a 4.8 not an is was it a 4.8i or a 4.8is
I think the is has more hp like 355 the 07 4.8i doesnt even have that much hp

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2007 335i Alpine White(moms)
2006 X5 4.8iS Sapphire black(Mine)
2007 Porsche GT sliver GT3