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Popping o2 sensor codes and I think i have a crack in my exhaust manifold. Since the manifold and cat are all one piece its not cheap. Is there a way to use headers with no cat and still pass emissions with no check engine light?. I have heard using spark arrestors or something like that with the o2 sensors and it will work. Just trying to figure it out before I go buy parts.
 

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Also here in Tennessee they don't do the old sniffer up the tail pipe test they plug into the computer so it has to be able to pass that. And where the cat us they can't see it anyway with the mirror test so thats not a issue either. Just has to pass the computer.
 

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Sry have to. But its header not headers. Ur main cat is in the midpipe. Just get an aftermarket header install it and get a anti fouler/spacer whatever u wanta call it. You will install it were the 2nd o2 sensor is and then the 02 sensor.

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