They just tell the ECM you've pushed the pedal further. So basically 25% pedal position become 50%, 50% pedal position becomes 100%, 100% Pedal position is 100%. Might not be the exact ratios, but exactly literally as it works.
Another thing to consider is that the ECM has a map that changes accelerator response based on RPM(and maybe even load) and pedal modifying boxes mess that up royally.
So save the $300 and just push your pedal further on your own.
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