holy shit. i can't believe the rust. you must feel a difference in steering/suspension with the replaced sub-frame I assume?
I live in an extremely dry climate (sadly) so this is not an issue for me, but I may as well check it... no harm, just time.

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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