When he "goes into VTEC" makes sense. I hear a lot of people say that or when they "hit VTEC". VTEC isn't active at every RPM, only above a certain RPM. The cpu senses when the car is at full throttle (or at least heavy throttle) and above that certain RPM (not sure exactly what RPM that is: JDMCivic might be able to tell you) and it increases the valve timing and lift to create more power. It also makes a "meaner"
engine note!!!Same thing as Ecotec, VVT, etc.
P.S. Not sure if I'm 100% correct but Im sure JDMCivic could clean it up if I have any mistakes, Im pretty sure thats the general idea though.