OK, swapping to pacesetter lt's and ORY.

gotta wait and see when I can get to Alan's place for a retune but in the meantime,

1. there are two O2 sensors that screw into the header collectors, what is the 3rd sensor that is a little further back?(after cats) another O2 ??

2. how will my truck run whithout the 3rd sensor installed

3. from what I understand, after the header swap, my truck should run rich until properly tuned. Is it ok to hammer down or do I need to take it easy until tuned.

I did try to search but didnt find the answers, so thanks in advance for your help or if you can link me to the info.

eric