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I've had a 2016 550i xdrive for 3 months now. It has 30k on the clock and is CPO'ed. Just put M5 mufflers on and removed the center muffler and resonators and it sounds mean but there is drone at less than 2000 rpm but the valves are always open, piping the valves should solve it. Paid $500 for the cat back exhaust second hand with all mandrel bends. Had no major problems so far. Put about 3k miles on it and got the low oil level message. I think it's going to need routine oil. Dunno if this is just normal or is a sign of an issue that will be costly down the line. Stock drives soft and needs a tune, Coilovers, and swaybars.
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