pulse timing and scavenging and all that kinda go out the window when you're stuffing 12 psi into it...
You want to explain the physics of that statement? Because that's not how the physics I learned works.
Pulse timing and scavenging change due to the different air density, but they are still there and still important. More important, in fact, since you are trying to move more mass of air.
Runner cross section size is also very important to the resultant performance. One of the significant reasons for the twin torque peak on the production SHO engine is that the secondary opening changes the cross section size of the intake. Here is a link to more reading on that topic:
http://www.rbracing-rsr.com/runnertorquecalc.html
Here is another interesting site regarding intake designs:
http://www.team-integra.net/sections/articles/showarticle.asp?ArticleID=471 btw, for forced induction, you just change the VE to a number larger than 1.0 depending on the psi you plan to run (i.e. 15 psi would be VE of around 1.9)
btw, I expect that moving the injector location will be an exercise in frustration, as the injector timing will be affected, and I am not aware of any programming tool that allows modification of the injection timing.
Hope this makes up for my not reading carefully this morning before I had my morning coffee.....
edit
Tom posted his response above while I was writing - and I respectfully disagree with some of his comments. I know from experience that runner length after a Roots blower makes a difference, and changes the torque peak rpm. Somewhere I might even have dyno charts showing that. I think the plenum volume after the Roots blower is still important, its just that its difficult to actually make one small enough that its too small given the configuration of the blower. If the reflected pulses from the individual intake valves disrupt the flow in the plenum, then its too small, regardless of what is driving air into the plenum.
