This is what I found about Sprint booster but never tried it myself.Don't know if it will be harder on engine/transmission?
A sprint booster increases the rate of change of voltage vs pedal position. So for a given increase in pedal position, the sprint booster yields a larger increase in voltage compared to when stock. It fools the engine management into thinking you are pushing the pedal harder.

To me it looks like that you are just saving your foot effort to reach that throttle position.

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