alcohol injection is much cheaper in the long run and it works all the time as opposed to an occational spray from the co2 (again it can hurt hp when your intake sucks in the co2) also alcohol injection can make MUCH more power by increasing timing and you can run a 12% nitromethane mix in the meth to gain even more power. the alcohol inj can cool intake temps by as much as 250 degrees, much more than the co2 will get you when you spray your heat exchanger. honestly the cryo setup is mostly just for show, it is a waste of money. most people that get it use them for car shows or just to purge to "look cool"