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There's two cats, one in the header and one in the front pipe. The Factory O2 sensors are around the cat in the header, so no catted front pipes need bungs.
If you're not worried about the CEL (or will have it tuned out), just get the header with bungs in it. You only need pre-cat O2 for closed loop, the post-cat O2 just tells the ECU how well the cat is working, and has no effect on how the car runs.
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