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Honestly this doesnt suprise me at all. I have already experienced this with my other car where the JDM exhaust manifolds dont have the O2 located in the primary manifold like the US version but instead its in the secondary manifold or otherwise known as the downpipe. I can almost guarantee that this is the case with the JDM Fit as well that the O2 bung's stock location is in the secondary and not the primary like with the US version.
But for some reason the JDM aftermarket manifolds for the Fit come only as a primary with no downpipe so like Ben said if your wanting to use a JDM manifold, basically the only option is to make a O2 bung on the manifold in the stock location of the stock manifold.
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