Z6 is one of the better ones i'll give you that, but quoted power you might read is one thing, actual power is another. Assume its making 115-120 in stock form. If you're going to the expense that you are my advice (and i do have some knowledge here ;-) ) invest in some better valve springs, Skunk2 should list them. Then look at raising the rev limit, give yourself some more time between shifts, VTEC is quite short lived on the D16