As any fluid moves along a boundary it develops a shear stress that brings the velocity of the fluid in the "boundary layer" or the thickness between the inner diameter of the tubing and the actual flow speed of the fluid to zero.
This means that as John says the surrounding boundary layer of fluid in the conduit, in this case the primary manifold will be "wasted or dead", so he is 100% correct in this regard, so I don't see what peoples problem is with the manifold in this regard >?
It's really good to see people actually developing solutions with a true engineering approach, it's in this sort of development that creates the invisible gap between what you can buy off the shelf and what you can see performing in racing series.
Also on the IHI RX6,
It's indeed true that alot of the development accrued on the F1 program went into the RX series turbo's the fact is that they are not actually the same turbocharger and although they were a fantastic turbocharger there are probably alot higher performing turbochargers available.
Also, KKK is the brand, not the type of turbocharger ?
Found on alot of early Big japanese GT-R's F1 engines and even one of the Lancia stratos models blowing on a Ferrari engine
Anywho, keep us posted Bobby