Chwk is in BC, Canada

we have done away with emissions..
i was getting bank 1 and 2 cat failure errors so i brought it to a trusted Euro mechanic and he said both cats are going to need to be replaced..
the x5 is at 188k km's too so would love to make the upgrade

only reason i worry about having a CEL light on is.. i hate error/dash lights being on to begin with, even when i see the gas icon pop up, plus if i wanna sell it in the future no one is going to buy it with an engine light on

on that note i'd love to find out if there's an 02 sim or a spark plug non fouler.. if anyone with aftermarket exhaust could chime in