Rear subframe is the big one, and also keep an eye out for the oil pump nut loosening on the S52 causing oil starvation.
I had four Z3Ms back in the day, two S52 roadsters, an S54 roadster, and an S54 clown shoe. Adorable cars and loved every minute behind the wheel. I did blow the rod bearings in the clown shoe car but thankfully it was under warranty, you'll have no such rod bearing concerns with a 99 model year.
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