Quote:
Originally Posted by Mr.X5_3.0si
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 
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Hmm. Ive run hundreds of thousands of miles on CATs with no failures. Plenty of cat codes usually related to rich running causing the cats to be overwhelmed....so you fix the actual problem and the cat codes go away.
Did this trusted euro guy explain the odds of two cats failing simultaneously?
But I can see you REALLY want to replace the with nothing- so lets hope someone chimes in.