Beef if I had the time I think I'd give the EFIE and HHO a try, because you never know. I'm not too worried about leaning out the EFIE, most engines have good knock sensors and will retard back if you go too far. I would definately go very little at a time though.
The most common thing to happen would be knocking and while this is bad under load or over a long period of time, you'll be watching for an expecting it, so it won't blow up your engine. The worst thing I could imagine happening would be the H2 exploding the whole thing before TDC and twisting a crank or breaking a con rod, but this isn't that much different than pinging so I don't think I'd worry about that too much either. Plus we'll never make enough H2 to explode that quickly. Even 2L/min is far less than 3-5% of the charge, right?
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