This may be a dumb question, and if so a quick, simple answer will suffice. Why do we not make an intake manifold that is like a reversed equal-length exhaust header. Instead of having 4 equal length exhaust runners merging into a collector, why not have the UICP attach to a 2.5"-3" collector and then from that run 4 equal length tubes to the intake ports. Everything will be symmetric as far as separating the one mass of air (UICP) into 4 masses (runners/ports). No need to go through all the hassle of trying to get airflow to be evenly dispersed in an asymmetric manifold.
Is there a simple reason why this will not work? If this is a great idea that no one has thought of, it is now copyrighted and patent pending as of today
EVOlutionary