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Okay so I have a 2002 nissan altima 2.5s auto and the top o2 bung i guess just rusted off and came off with the o2 sensor still intact I plan on replacing the whole manifold with a header but my question is where do I put the spacer? Under the car on the 2nd cat or on the lower o2 sensor on the header??
 

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09 Altima 3.5SE 6MT Sedan
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Should go on the O2 sensor after the precat (so lower one on the "manifold" assembly). The second converter isn't metered AFAIK. That's the theory anyways.
 
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