Vvti(variable valve timing intelligence)Toyota
Vtec(variable timing electronic control)-honda-s2000, b series engine
Ivtec(intelligent variable timing electronic control)-honda-all new Honda motors 2003-4+ with (06 si)
Vanos-BMW


Seeing as you came from a k20z3 with ivtec you won't even notice a vvti system. You feel it working in a very small way around 3800-4000rpm mark, where the car will pull harder in a small kick similar to vtec. But not even close to the physical,audible feel of vtec