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That website is full of so much BS its not even funny. Don't waste any more time or money even looking into it. Producing more power/fuel economy in that method defies physics, but if you want to do it go right ahead.
Look through the diesel forums here, I'm sure there's talk about it. Some say it actually works, but ...? It defies basic physics. I suspect that the hydrogen is doing more than adding energy, more like increasing dynamic compression.
The programs say it is easy to find local parts, but everthing you need is special order from some where. A few things are at the hardware store but most are hard to find, but they do tell you were to buy them.
Don't waste your money, unless it's already to bolt on.