I think I found turbinetech's IC core supplier. 0.1 -> 0.2 PSI pressure drop.
Here's a wacky idea. Mod a TMIC so the exit endtank has a new outlet and put one of these between your air:air IC and throttle body.
Put a water resoviour in and you can throw ice in the resoviour to get boost temp below ambient...
Or...engineering tangent here - use a thermoelectric heat pump (peltier element) to moderate the temperature of the IC water collant (below ambient) and get tighter control of BAT's....a peltier element could quite easily start freezing the coolant at full volume...