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options:
1. you can have them tuned out, ,i think most handheld programers will do this or get ahold of someone who can custom tune GM vehicles with HPTuners or the like.
2. Buy (2) cats and (2) 02 sensors and have them installed. Clear the codes and drive her around.. And you will also have to drillout bung holes for the 02s.
I think you easiest/cheapest option is to have someone tune them out for you.
What is your locale? There might be a tuner or atleast someone with a handheld that could tune them out for you that lives near by.
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