I won't talk about your specific car but DBW cars in general. The delay is caused by a quick change in resistance value, throttle plate position, and the computer's ability to adjust everything including fuel delivery in a split second. By modifying the resistor value, you can trick the computer to open the throttle plate sooner so when you barely press on the gas, the plate will actually open to 40% instead of just 5%. By the time your foot gets to the 50% throttle position, the computer already has the throttle plate opened to 100% so the response is quicker. The problem is that by modifying the resistor value with another electronic component, you can open up an uncontrollable situation if something fails. In other words, if the unit overheats and fails and sends a false resistance reading to the car's computer, you could end up with a full throttle situation with your foot OFF the gas pedal and cause a major wreck.
Basically, that is what those throttle boosters do. They simply change the throttle plate position quicker than normal. Obviously a chip reprogram would be the way to go but they want an arm and a leg for those.
Edit to add.......if you want to try the Sprint boosters, they do have a 30 day money back guarantee if you don't like it. They install in 10 minutes and are plug-and-play. If you don't like the way it feels, send it back.
[This message has been edited by IMSA GT (edited 04-06-2017).]