Hi Mike,
Based on your signature, it looks like you have a 2003. Your primary O2 is located after the collector on the header, isn't that true?
I believe they changed the '05-'06 to have the O2 built into cylinder #2 only.
I'm going to extend my 02 sensor wires and see if I can relocate my sensor to the lower bung like yours and see if that makes any sort of difference.
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