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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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don�t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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