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There are 4 cats in the stock setup - 2 in the headers and 2 in section 1 (as indicated by maupineda). The original locations of the O2 sensors are in the headers. Since you've got catless headers, the O2s should have been relocated to the section 1 cats. So make sure you first have OE cats in section 1, then look and see if the O2s are there.
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