Unlike M50i, it looks like M60i's stock downpipe is very similar to ones in previous X5M where we can either do full downpipe upgrade or simply do secondary cat delete.
Here is link for full downpipe.
https://redstarexhaustusa.com/bmw-x5-x6-x7-m60i-downpipes
Here is link for secondary cat delete.
https://redstarexhaustusa.com/bmw-x5-x6-x7-m60i-secondary-downpipes
I will most likely do full downpipe later this year, but want to see if anyone is planning to do just secondary cat delete and see if it brings out any good improvement to the pathetic sounding stock exhaust.