Yes..... it can be done, and it's not even that difficult. You can upgrade any 2019+ model X5 or X6 with an X5M 6-piston big brake kit.
Make sure you buy an ENTIRE kit:
OEM (F95 / 2020) X5M/X6M Calipers
OEM 395mm drilled/ventilated Rotors
OEM Caliper brackets
OEM Caliper bolts (M12 X 1.5 x 85mm)
OEM X5M brake pad sensor.
OEM X5M dust shields (only required if upgrading from standard brakes)
This is IMPORTANT.... The caliper bolts do not have a part number, and are incredibly difficult to find.
The caliper brackets don't have a part number either. They are sold as a part of the caliper, and because such, they are unavailable to purchase separately.
Installation is easy..... took a little over an hour per side, including bleeding.
Noteworthy items:
1) No need to remove/replace the dust shields on a vehicle with blue (or red) sport brakes (X5M rotors are 395mm, only 10mm larger than sport brakes). On vehicles with standard brakes, you probably want to make sure you get OEM X5M dust shields.
2) OEM caliper bolts are re-used. But, instead of attaching to the caliper, they attach the the BRACKET. Then, the new X5M caliper uses a second set of (X5M specific) bolts, to attach the caliper to the bracket.
G05 X5 calipers - Caliper side-bolts directly to hub
F95 X5M calipers - Caliper top-bolts to bracket. Bracket side-bolts to hub
Note: F85/86 (pre 2019) X5M brake parts are NOT compatible. Do not try to mix/match. The calipers, bolts, and brackets, and rotors are all slightly different. NOTHING will fit.
3) X5M brake pad sensors are different than sport brakes, but they are plug and play with the OEM wiring. No mods needed. But, you must get an OEM X5M brake pad sensor (only on the left side)
4) Hydrolic brake lines match up perfectly. No issues, no mods required.
5) the rotor alignment screws are NOT the same. The holes for them don't line up either, which means you cannot use the screws anymore. No safety issues, but it does make re-installingbthe wheels a little bit more difficult. To do the install, highly recommend a wheel-installation tool that will align the hub, rotor, and wheel. Otherwise, installing the wheel is difficult. Keep the tool in your car for roadside flats... just in case. I did the install without it, because my tool was at home, and it was a PITA.... but it can be done.
6) No coding required (if upgrading from sport brakes. Standard brakes may be different). Pedal feel is identical. Brake "grab" is identical. Car feels no different whatsoever.
But..... it sure looks cool
7) I HIGHLY recommend the eBay seller "testcarsbmw" in Poland. I only purchased the front, but he can hook you up with a full front & rear setup if you like. This guy DOVE THROUGH HOOPS to make sure I had everything I needed. Super great seller. Here's his eBay store:
https://www.ebay.com/str/testcarsbmw