The downstream sensor just tells the computer if the cat is working. The upstream is the one it uses to set the fuel mix.
I think the upstream sensor only reads one cylinder bank anyhow. If one wanted it to read both and to run a dual exhaust the thing to do would be to put in an X pipe and put the upstream sensor in it.
A dual exhaust isn't going to make much difference with the stock manifolds, other than noise.
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