Welcome to the forum and to BMW.
The lower control arms need to be replaced at 100k km or so intervals, so have that tended too asap. If you can get the car on a lift/ramp and swing a spanner, it's an easy DIY.
If the turbo has never been done, then you might be in for a replacement or just a refurbishment. Have someone just overall the turbo and you should be good to go.