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We're tricking the PCM into thinking the HPOP pressure is low, so the PCM increases the HPOP pressure during the fuel injection cycle. This helps introduce fuel into the cylinders faster during each cycle.
Do a search for "ICP Resistance Mod Results" and you can see what the different resistors did for my horsepower and torque readings on a DynoJet chassis dyno.
I'm currently monitoring MPG changes using each resistor.