heres a quote on ht from a air to water vs air air thread after someone said air to water intercoolers heat soak and lose power.
"The energy taken out of the charged air is transferred to water... that energy is then transferred back to the air... it is a cycle. If the amount of heat energy entering the system from the compressed air is more than the rest of the system can dissipate than you have a system where more energy is entering the system than is being taken out, you call the heat soak.
To correct or prevent this, you design a system that can remove the same amount of energy that is being put in. You can do this by increasing the volume of thermal mass absorbtion (water, water wetter, coolant etc.) or by increasing the amount of energy removed, i.e. the radiator or heat exchanger or fan. Or a combination.
I have a TEC-II on my car and can monitor (MAT) Manifold Air Temperatures. On a 90* day I consistently see MAT temps within a degree or two of ambient, whether on boost or idling in traffic. Same thing when it is 32* outside.
Of course there are limits to everthing. My current setup would heat up over time if I were road racing (constantly on boost). If that were the case I would increase the size fo the heat exchanger, as you would have to increase the size of an air to air intercooler. But for a road car that sees a little of everything (off boost and on boost) the systems works just fine"
So basically your friend,If he add a better heat exchanger,and bigger tank would have a better system on the street.The vortech unit's heat exchanger is the size of an oil cooler.Ever seen a mustangs or lighntings?They take up most of the grill,but most of the time you don't notice them.
Good way to avoid answering the question though

but at least some decent tech came out of this for the OP