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Another thing you can try is relocating the secondary O2 sensor behind the cat in your front pipe. Weld a bung, extend the wires, profit. The primary O2 sensor needs to stay in its current position though.
This information was garnered from other posts here and is not my own experience, so take it with a grain of salt. This is my plan if I decide to go with a non-catted header, in addition to tuning the cat inefficiency code out.
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