It will be less expensive than the Top Speed intakes.
I too looked at these and
over them. (Especially in the gloss black coating
) but couldn't justify replacing the stock air box with another air box. However I don't think the loss of power vs the Gen III's will be that tremendous.
However I will let you know there are 3 companies that are making intakes for the Z that should be rolling out very soon, if you can hold on just a little longer.