[Koots]

I doubt it will work. i've used water to clean the carbon out of my engine before and it does actually work (i let engine vacuum suck it up)

But they claim that it will up compression ratio and give you horsepower. That is BS! if you clean the carbon buildup out of your combustion chamber it will actually reduce the overall compression ratio as there is no more carbon taking up space. If they were to not make this claim i'd give them some thought, but it's basically just a sales gimmick.

You'd be better off just letting engine vacuum suck in some water to clean it out and get it done for free. it will produce the same results and cost you very little to no money (depends on quality of water you use)