[Pruzina]

Hey would like some help.
05 645ci. Getting bank 2 catalytic code. During driveshaft service I found that my bank 2 catalytic is completely missing internals. bank 1 is ok.

Question 1 did someone attempted bank 2 cat replacement while engine in car. I can imagine that if it's possible it will be major pain in the ass.

Question 2 does anyone knows if cat from 650i or 550i would work? realoem shows different part numbers but as it's essentially pretty similar engine it may maybe work.

thanks