The 4.6 and 4.4 intakes, ccv and separator systems should be identical. Are you taking about hose #12:
https://www.realoem.com/bmw/enUS/sho...diagId=11_2817
That one runs from the insanely fragile and tiny nipple on the CCV to the smaller of the two return hard-lines that empty separated oil into the pan, down by the starter. It’s a huge pain to install since it runs under the intake and there is so little room to connect it, both to the CCV nipple and the oil return line. I was changing my starter a few month ps ago and realized that it could make things easier to do the CCV and separator job to unbolt the return line at the pan (probably needs the crush washer changed anyway). Then a helper could push the return line up which might allow for easier connecting of the two hoses at the top (the thin one above, and the very short one from the bottom of the separator).
Beyond that, the X5 4.x intake has a breather line inside of the intake from front to back, where it attaches to the CCV. It’s the only thing running front to back in the intake…and it’s inside of the intake. It has o rings that should to be replaced when the intake is off. Number 7 here:
https://www.realoem.com/bmw/enUS/sho...diagId=11_2281