You wouldn't have noticed anything if you didn't have a problem to begin with. This is not a performance mod and you will not notice better starts. What you may have noticed is better performance due to resetting your ecu.
It only fixes a problem with a mild hesitation while accelerating throught 3-5K rpm.
If you are having problems with a slight jerk at 3-5K rpm do this mod. It works... fixed me anyway.
-Jonathan