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      09-21-2020, 03:03 PM   #10
Gneiss
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Drives: 2009 135i
Join Date: May 2015
Location: Colorado

iTrader: (1)

Sorry to resurrect an ancient thread. I am also in Colorado and am looking for a way to pass emissions without having to reinstall stock DPs and then remove them again.

Has anyone heard of anyone moving the O2 sensors to behind the secondary cats? I understand it may take longer for them to warm up this way, but wouldn't you eventually achieve readiness?
Appreciate 0