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2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
I would only suggest putting the Pre-cat O2 sensor in one bank or an x-pipe. H-pipes usually do not get much actual gas flow, it is mostly just the pulses that pass through it to balance the exhaust. Therefore the O2 sensor reading in an H-pipe would not be accurate.