Raiding 4.Xis and e70s for upgrades?

[BMW DIY Guy]

Hey yall!

I am looking to start upgrading various pieces of my 2001 E53 X5 4.4 with sensible upgrades from the later models, and would love suggestions.


What areas should I focus on specifically? On the radar right now is the following at least:

1 E70 X5/6 M big brake upgrade. This seems sensible plus using OEM parts, read up on the thread on that. These appear to be just fronts though?
https://xoutpost.com/bmw-sav-forums/...o-upgrade.html

2 Aluminium style actual running boards. I am digging into replacing running boards and wheel arches with the real board style, not just the plastic trim I have now.

What else? I am used to raiding future or ///M models for tasteful upgrades, and looking to do the same here.

Thanks!