Water meth kits are something that works very well. however, if you get to crazy and put in more than 50% meth, you run the risk of getting hot and of popping the head gasket. Most guys just use Windshield washer fluid, its about 10% meth. For the price, its a pretty good deal, especially if you have an EGT issue.
We offer the Snow kits, if you are interested in a price, or more information.