When converting an OE system to a dual exhaust system, what is the best solution for handling the Oxygen Sensor...eliminate it, relocate it to a H-pipe, or just put into either of the gathering pipes. Also does any one know the function of an Oxygen Sensor. I have heard of many things that it can affect, but not it's true function.

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1985 F-150
5.0L EFI
Originally:
2WD Manual 3 speed + OD
3.07 Rear End
Modified:
4WD Manual 4 speed + OD
3.55
Used Front Suspension, Transmission, Transfer Case, and Rear End from a 1991
Bronco