just dry ice is not the best, the co2 is a gas, thus your working with convection, which is not an efficient process, add some alcohol to the process ( alcohol will not freeze like water, it will turn to a gel, but will conduct some heat !!!!)and then you will have conduction working for you, water and antifreeze will also work, anti freeze would be safer too, but conduction is a far more efficient , we use this to cool bearings and bushings for a press fit, and it is a grat combo to cool, but it will not work for long, great for a drag race, bad for the street, unles you can make the tank removable for the street, just my 2 cents
Grant J Farmer