Engine replacement and panoramic roof

[Layth.94]

Hi guys,
I have x5 00 4.4l, now im not complaining about 4.4l 286hp speed or anything but i would like to fit in an engine that can offer more for example of a newer x5, M-series, or even a porche gts enginge (if possible), and to get a panoramic roof instead of the ordinary roof rack, i would like to mention that im not interested in buying a newer x5 as i love my x5 00 alpina white
Also if happens and was possible to fit anew engine what comes with it (eg: gearbox change and other related equipment)
Thanks in advance looking forward for your replies...