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All i know is that with the RSX, when u add an after market header u need to replace the o2 sensor with an o2 simulator, otherwise you'll throw a check engine light (CEL)
a popular and well recomended o2 simulator is the Caspers Electronics o2 simulator

it plugs some wheres in the engine bay to where the o2 simulator harness is.

so if your doing a swap and worried about an o2 simulator, just used the ones that came with the k20 (RSX, RSX-S, RSX-R, Civic SI) and add the o2 simulator.
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