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I used to have RDsport headers, race cats, x-pipe and exhaust. I also had their software tune to eliminate the CEL. The O2 sensors were not removed. I'm not sure about what the software tune does but I believe it bypasses the check programs from the sensors.
But if you're asking if you'll pass an emissions test or not, then I'm not sure. I think with the primary cats gone from replacing the stock headers with the RDSport units, you'll still put out more toxic gas even with the race cats in place.
But if you're asking if you'll pass an emissions test or not, then I'm not sure. I think with the primary cats gone from replacing the stock headers with the RDSport units, you'll still put out more toxic gas even with the race cats in place.