The best aftermarket suspension for air suspension is the KW V3 coilover. I have it on my X5 and it's very very good. Don't do just springs as the stock shocks are really soft and cannot keep up with the increased spring rate. Your ride will be so bouncy that you'll eventually want to replace the shocks too, causing you to spend twice the amount of labor and alignment.
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2022 X7 M50i Phytonic Blue
2019 M5 MBB (wife's DD)
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