What you put in changes what comes out
HHO may not violate the rules or it may. Everything that goes in the mix comes out the exhaust in some form. In California, the smog test will fail if the HHO generator is running at all. You would be wise to remove everything from the car before getting it emissions tested.
But, yes if you do it by yourself and for yourself there is less risk. I really don't want any more negative attention from it. I have dropped it like a hot rock. This is the last thing I will ever say about those three letters.
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