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Thank you for stating the honest truth about P0420 and catted headers and defoulers. You would not believe how many people are shocked when they still throw this code just because they bought a catted header. Most people don't realize how the O2 sensors work, and when you change the pattern of flow between both sensors, the ECU isn't happy. For the people that cruise on the highway, they tend to throw the code more than someone that city drives a lot.
Delete that rear O2 and call it a day. Turn it back on for inspection time then turn it back off. Easy peasy.
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