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Originally Posted by jmatta
The reason I brought up the CEL issue is the headers replace the existing cat/manifold which contains O2 sensors. I don't see how you could bypass the system (unlike the secondary cats) without disrupting the fore/aft sensors. Could someone please educate me on this?
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Well no one has had any problems because the bung-holes are still there for the O2 sensors on the headers. So in a way, it's just fooling the sensors into thinking the Cats are still on. As long as you keep at least 1 set from what I have heard, no cell light will come on.