Don't you think that you could get away with a 10-pound boosted engine with a water/alky spray, chemical intercooler and not use a real (air-to-air) intercooler... I said 10 pounds... no more than that????
Properly set up, water/meth can cool better than an air-to-air, so yeah, no problem. Personally, my only problem with using water/meth in a blow thru setup is that the methanol can affect the air/fuel mixture, and if the system is tuned to utilize that extra fuel and it's suddenly lost (like the tank runs dry), the possibility of engine damage is there. But, in all honesty I wouldn't think that would be an issue in a street engine running 10 psi, especially if the mixture was 50/50 or less methanol. Most turbo cars run rich at wot anyway.