Off the top of my head, have you had any exhaust rattles or noises lately, no leaks just rattle or noise
Looks like a mid pipe exhaust mounting bracket, one bolt through it to a longer bar/bracket fixed above, so again, no leak, just a rattle possible or noise of some annoying sort. Mind you it is there for support so a simple 10 minutes on a hoist and you'll be good to go. Assuming that is the lower section and not part of the top section which I doubt but either way not a "big" deal at all.
That will be $125.00+HST and Mary will accept Cash, Credit or Debit at the front, thank you for visiting BMW.