I picked up a copy of Water Car Pro the other day and absolutely love it. If you want to run your car on water, then this is the one I would probably recommend the most. I think the guy behind it (Oliver South) is improving it all the time, so I will definitely keep a close eye on how the product is updated…but so far I like it. But then again, I haven’t really tried EVERY other guide, and there are a few of them. I would prefer Water Car Pro over getting water 4 gas (another popular course), but there are a few other one’s out there.