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Originally Posted by niterydr
I am thinking they are acting as a restriction on the turbo applications.
All I know, is all the digging I've done, I have yet to find concrete proof as far as a turbo'd application is concerned. Alot of the intake manifold design has been taken from N/A applications. In N/A applications, they have been proven to open up the rpm range and add power in some instances. I haven't seen anyone do back to back research on a FI setup.
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It shouldn't matter too much if it's FI versus NA. At WOT in an NA application, you aren't at a perfect vacuum, you are really usually at ~14.7psi absolute. Just because we as humans don't feel the pressure, doesn't mean it isn't there. So, I don't see why at 30psi or whatever absolute pressure, it should be any different.
Velocity stacks are definately not necessary. You can make just about any design for a sheetmetal intake on a DSM and see significant gains in the upper RPMs.