The Vortech intercooler can be used with ice in the water, the battery-sized box has an opening for ice cubes (and whiskey if you like).
It is not true to say that intercoolers are designed to work with ice, they are effective when you are moving because they have their own radiator, as small as an
oil cooler, the electric pump circulates the cooled water to the intercooler just before the compressed air enters the throttle body.
Here are the numbers for intake charge temperatures that I measured:
Ambient temp. = 30 deg. C.
At 10 psi boost, no intercooler, 75 deg. C.
At 10 psi boost, with intercooler, 35 - 40 deg. C.
These numbers are consistent with Vortech's estimates.
The free space to install the intercooler hardware is the problem and probably the reason you haven't seen more of them. The Vortech Mustang kit is excellent and I recommend it.
If only I could find the extra space to install the ABS modulator.