Why SprintBooster Works
Please go to the Sprint Booster site and you will find that it operates exactly as I described.
In fact, it's worse than described. With the Sprint Booster the throttle reaches 100% at 75% pedal throw. After that (from 75% to 100% flat on the floor) nothing happens because the throttle is already full wide open.
As I said, just drive with a lead foot and it's the same.