I've got air suspension on my 50i and haven't noted any rattle type sounds at low speeds and I'm 3K miles in.
I do find the air suspension on my wife's XC90 a little more 'airy/floaty'. Not sure if that is a good or a bad thing.
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Current - 19 BMW X5 50i, 18 Volvo XC 90 Inscription
Past - 14 BMW X5 35i, 11 BMW 550xi, 08 BMW 550i, 09 BMW 335i, 06 BMW 330i, 04 G35 Coupe
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