I found a site
www.alcoholinjectionsystems.co that has water/methanol systems for nitrous, boost, and naturaly asperated engines. It has some faq"s that might help anyone interested in this. I didnt know you could do this with a NA motor. Interesting stuff. It seems the water/methanol cools the intake charge and reduces exhaust gas temps. It enhances combustion like high octane fuel. Hope this helps.