The CO2 is not compressed inside the Interfreezer, the solenoid comes before the Interfreezer unit and is holding the pressurized liquid CO2 behind it. When the solenoid opens the extreme pressure is relieved from the liquid CO2 and it converts to gas. The conversion of liquid CO2 to gaseous CO2 is what creates -109 degree temperatures. The gas inside the Interfreezer must be purged out somewhere or it may liquify again and insulate the air charge as you said (although I'm sure the Interfreezer would explode due to the tremendous pressure first). DEI offers a similar product, although it appears CryoFuzion's would prove more effective at transferring heat. Does anyone have any knowledge of intercooler design that might help prove or disprove the efficiency of the Interfreezer? Go to
www.CryoFuzion.com and read about the Interfreezer. (Mods please edit if no site posting is allowed).