hi yes its a race engine need power 3500rpm to flat outIIRC vtec-e in. lift is 0.1mm less, than the low z6/y8 lobe, less duration, too. So until 3k, only one intake valve is open (to create swirl and increase air velocity) and it is using a cam lobe with less lift/duration. After 3k, it just hooks up the second set of valves, while with z6/y8, both intake valves are switching to even higher lobe. So the answer is - no, it's not better - not with the current cam. A custom cam can be made, but prior switching from 12 to 16V, said engine will make less power, compared to stock z6/y8. So if yo want all around power and you are not doing high rpm ONLY, race engine, don't bother with the vtec-e.