What the heck are these CEL you all are talking about

What is the"L" in VVTL-i Yes, yes i know it stands for lift but what exactly happens in the engine? I have found no real good explanations. Does anyone know, what would be really great are some technical documents about this. How does it change the lift? Any info along these lines would be...

I am thinking of buy a CAI, but my father has other thoughts of not messing up the new car. But luckly he said if i could bring substantial info he wou THINK about it. So i need number, plus a saw a dino before and after read out on a injen CAI but i can't find it now. if some one could find me some...