The reason I am looking into the Interfreezer unit instead of an air-to-water IC is because of the limited underhood space I have the work with. I do understand that the CO2 cannot flow constantly - it wouldn't last very long at all. I plan on purchasing a 20 lb. bottle so refills won't have to be so frequent. My plan is to engage the system during the burnout at the drag strip, or maybe before prestaging depending on how fast the air charge is cooled. I'll leave it on for the duration of the run and disengage it after I've passed the quarter mile marker. What do you think of the Interfreezer vs. a usual Air-to-Water IC in terms of size (therefore ability to transfer heat). Most Air-to-Water IC's I've seen are fairly small and comparable in size to the Interfreezer. Probably due to H2O's greater capacity for heat abosorption?