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Re: wideband emplacement
If you only have one wideband A/F to work with, you are tuning for worst case, which would be the leanest cylinder, which is usually the last cylinder fed fuel in a stock Subaru setup. Are you going to be able to tell which of the six cylinders ran lean if you put the wideband back at the Y junction? Nope. Does it really matter as long as you know the side that could run the leanest is still in a safe area of tune? Nope, because the other side/cylinders are going to running a safe ratio because the leanest one is.
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