I have been running a coolingmist stage 1 kit in my hilux with the controller added in now and wideband aem a/f (3.4l v6 trd supercharger) for ages now. Ive tried running water, water/meth, meth back to back and its all good in a nutshell. Water actually removes more heat than meth but meth gets rid of heat faster. I'm super interested in trying nitro in small quanities but still have a lot to learn about using more and more meth. I have found more and more meth (bigger injector and now trying 80/20 mix) just seems to keep adding in hp. I picked up 30hp just from adding in the original kit with the boost switch only. Its awesome stuff. Methanol is easy for me to come by but for the guys starting out the 50/50 mix is great. My bro bought the basic kit to add onto his car as a safety buffer zone for the track only.
Check out this link for a brief overview of water/meth systems. Its a bit cheesy but its pretty simple and makes perfect sense.
You guys could have used it a few pages back by the looks of it.
Bit of experience with these kits tells me that the coolingmist ones seem to be the best with aquamist a close second (coolingmist has a better controller IMO mapping from not only boost but can use 0-5v from afm if you still have one). Devils own/AEM ok but $$$ not as good as the first two and snow kits are probably better left alone.