To the OP, what are you looking to gain?
JUST Bluetooth and handsfree? Then get the BlueBus. Search for it on this forum

if you want the NAV screen, then do an aftermarket but be careful of which you choose to work with your DSP and make sure it looks proper in the dash as some of them look like shit.

Sent from my Pixel 3 using Tapatalk

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I swear, my cars are like a girlfriend.
Sometimes its a rough ride, sometimes its smooth motorin'.
Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
BUT at the end of the day, she loves it when I am inside her.

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'91 850i
'05 X5 4.4i
'09 Clubman S