Stay away from pedal commander or sprint booster. Tried it. All it does it remaps amount of gas pedal travel needed to reach 100%. Doesn't do anything else. If you have seat positioned correctly and you are utilizing the full pedal, you will not achieve a difference and actually you will loose the control as less pedal travel control you have (ex. pressing between 50-100% is already at 100%) If you are only using part of the pedal travel, you will notice the difference as less pedal travel is needed to achieve 100%. As well Sprint Booster in their advertisement video shows that throttle responds quicker. Bought two (4runner and LC) and no difference in throttle response.