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The clunking you hear is most likely your steering rack not being secured. It is loose and every time you turn left or right, it will shift and make that noise. There are two bolts you need to fasten down to 41ft-lbs near the center of where it attaches to the subframe.
BMW recommends to replace the nut and bolts, but you might be able to get away without replacing it.
Hope this helps.
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