gtr intake ports

[nickz]

close to sending out a bp4w head out to get cleaned up,compared the intake gasket from said head to a "modified" gtr intake I got a ways back.
the ports don't come close to being the same size at all.what's up with that?It looks like from the pic Ive sent that they intentionally made them smaller by filling in the casting in the low end of the intake and top end a bit.Does anyone know if the entire runner is smaller than say a bp intake?
I know for a fact the intake port on a bp26 is the same size as a bp4w by comparing to one.
Did mazda use a smaller intake "runner"on the gtr and "restrive" head for the sake of low end grunt?

[jay]

There are a few theories. One says they wanted/needed more flow velocity. One other one says they restricted the ports to reduce power output. I wasn't there so I don't know. If and when I do a rebuild, I shall take the whole assembly to an expert and see what he says about the subject.
Cuz I isn't one. But I am a suspicious character. I wanna see before and after flowbench results, or even gtr head/ NA head test results.

[nickz]

the intake manifold as well?look at those ports,theyr puny compared to the head.they are really are.
Im not happy.