So I've always been keen to the idea of injecting hydrogen into you auto engine for a more efficient running engine. A lot of people do this in Australia and in New Zealand so I've always wanted to make one of these kits. It doesn't look much more difficult than building your high school science project. Then I recently came across a website called
Saveyourgasmoney.com which produced a whole kit that they say is easily installed in 2hrs or less.