Just so you guys know, the speedbooster/sprintbooster thing is just an amplifier... i.e. Pressing the gas pedal in 2/3 of the way without speedbooster gives you 2/3 power, with speedbooster gives you full throttle. If you're pushing the pedal down at full speed, the difference between going 2/3 of the way and all the way is usually less than .1 seconds. The only reason people think their engines are more responsive is because they are getting throttle response before the pedal hits the floor. In other words, the "speed"booster doesn't really speed up anything at all.
If you really want something that essentially puts all of your throttle response in the first 2/3 of travel (increasing sensitivity, but decreasing "feel"), then by all means, go ahead. But understand that the circuitry required to do this (essentially a voltage multiplier on the signal the pedal sends to the ECU) costs maybe $20 at most.
<--- Electrical Engineer
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