all manifolds have the VICS. the mp3 doesn't have the VTCS. do a search on these to better inform yourself. but the 626 manifold I mentioned earlier is the way to go. do a search on that too.
I would think that having a manifold with VICS (but the buterflies removied) and no VTCS would be ideal. That way you get no restrictions from the VTCS tumblers and no restrictions from the VICS butterflies, yet you get the advantage of the VICS resonance chamber. I think that maybe the gains people have seen come from the lack of VTCS tumblers. I'd like to see a test between a 626 IM (no VICS / no VTCS) and an MP3 IM (yes VICS / no VTCS). I was actually thinking about getting an MP3 IM and taking the VICS valves out.
Yes, it's a benefit to keep the VICS butterfly valves, but not the VTCS. Also, VICS isn't a variable runner setup, it's a Variable Initia Charge setup. It opens up an extra volume to time the intake pulses with the opening of the intake valves. This is different than what Honda uses on their engines, which has a long runner to create a column of air that doesn't slow down much when the valve is closed, and a short runner for max flow at high rpm.
VTCS is just a tumble valve for emission purposes. When the engine is cold, it closes off part of the runners to create turbulence and cause the air and fuel to mix better. When the engine is warmed up and the valves go back to their fully open position, they still are in the path of flow and restrict the intake.
