hmmm.....bag me if you will as I'm a relative newbie to all this stuff - but I do know fans and pumps in process industries.....

I had a look at the CAI results and would like to pose some challenges to the notion.

From Robs data I've looked at it from another point of view.

Forgive me if I talk in kPa - that's what I know best (Australia).
1 atmosphere is 14.7psi, or 101.3kPa or roughly 400in WG
Your manifold pressure supplied by the SC is around 12-18 psi or lets round that to 15psi for this arguement - or 105kPa

When you have a restriction on the suction side of your blower this will detract from the discharge side. This is more the case with fans etc. with plenty of "bypass" around the vanes - but for SC's they are almost a positive displacement device with very little slip past the vanes and ill therefore simply demand more power for the same rpm with little effect on the output.

Lets put that aside....

I have rejigged the numbers Rob presented into a flow base instead of pressure based.
see attached.
I have allocated 2 nominal levels - 400cfm and 650 cfm and recalculated the drop backwards based on the square rule..."double the flow rate and you quadrouple the pressure drop".

Form this you can see the presure drops are small in comparision to the SC output mentioned above and what we are all chasing. You might get a 2kPa benefit from best to worst...and in the scheme of an SC (based on the 105kPa I've presented above) that's about a 2% improvement in performance.
And that's not withstanding the comment around it being a positive displacement pump and not greatly affected by suction restrictions.
Also of note - pressure and density wise....2kPa is roughly (again I use that word) equal to about 2deg in AIT...I think you'd be much better off chasing AIT's than intake pressure.

Shoot me down - I'm happy to open up the discussion. as I say - I'm a noob and could be missing something here.