What do we know about the z1 lower intake manifold?

Mysilverz

So I called Z1 today and asked a few questions about this part. I was told I could expect a 3 to 6 WHP gain with a proper tune and supporting modifications which I already have. I asked if the increase was in any one part of the power band such as high or low rpm and they said they've seen the gains through out the rpm band. I think Im going to save up some money and order the Z1 power plenum and pair it with this ported lower intake manifold. If I go through with this ill make sure to do a before and after dyno. The way I see it if I can get a decent gain through out the power band for the total of $625 for both parts it will be money well spent.