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I also used the foulers on my exhaust system after installing a 3.4 with headers and cat deletes. I would get a CEL every so often and have to erase the code to get the light to go away. It was always the left rear O2 sensor. I even changed out the rear sensors hoping that would help. I ended up taking my box to a friend who threw a ROW tune on it and I haven't had a light since. ROW tune doesn't care about the rear O2 sensors
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Woody
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