you have a front mount, not a top mount - its getting cooler air all the time. I know the evo's have front mount spray - but id really like love to see how much difference it realy would make.
The nitrous systems are the same thing -they freeze the whole intercooler. They say they make more power becoz the intake is actually sucking in some nitrous as it is being sprayed onto the cooler - when the blocked the air flow off to the filter (boxed it up) it make negligable power gains.
So id say the same things for the CO2 systems. I cant imagine spraying CO2 on ur front mount would be healthy when your intake sucks up the gas!