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The zener diode only works on the SD trucks since the SD map sensor has a voltage output. The OBS map sensor has a frequency output so the resistor will not work. The OBS map fooler is a pressure regulator or pop off valve that limits the pressure that the map sensor sees (about 22 or so psi).
If yo disconnect the map sensor on an OBS truck and the truck runs better, that means your map sensor is defective and should be replaced. Unplugging the map sensor makes the PCM revert to a default condition as far as map sensor input is concerned. A working map sensor will make the engine run better than the default condition will as it is responding to actual operating conditions.
There is a resistor mod for the OBS ICP sensor that increases the HPO pressure (10K mod) and generally will increase low end torque.
1997 F-250 SuperCab 4x4 408hp Banks Powerpack, stock muffler
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and some other stuff