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I need so help with these O2 sensors and my long tube headers. Ok the problem is this my hooker long tube headers have no O2 bung holes in them. Should I drill the hole in the collector or will I be safe in drilling the holes for the O2 bungs in the y-pipe right where the Y-pipe connects to the headers? Reason I don't want to drill the holes into the headers is because I don't want to start cutting into these things if I don't have to, I'd rather drill into the y-pipe. But if I have I will. Also I'm only running the front two O2 sensors.
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