Schmoe,
I still stand on the fact that this is too good to be true, citing the rather "inefficient" means of generating hydrogen by electrolysis in order to be fed as "Brown's gas" into the system.
Yes, while academic fields agreed to the fact that brown's gas has huge potentials when mixed with diesel or LPG in providing an optimal combustion efficiency, the trouble I see is that this device is too "crude" (without proper metering device and such for the retrofit for various vehicle models and engine types) to be able to provide precise, yet consistent research quality results to be proven.
Afterall: Hydrogen gas isn't free so it has to come from a converted form one way or the other. Whether it comes from breaking down of natural gas or home electrolysis or even an onboard miniaturised electrolysis can, the energy conversion still comes as a net loss in energy (can't beat the 2nd law of thermaldynamics where it describes as "there's no free lunch" during energy conversion). In other words: the net energy obtained from electrolysis to break down water into Hydrogen gas and Oxygen gas shall be less than that of what is fed as a form of electrical energy input (the loss energy comes as heat).
In the interests of global energy conservation, improvments , conversion efficiency, etc. I still don't see the subject of introduction of HHO or Brown's gas (or even H2 gas, just for the sake of argument) being put through proper researches and tests by various scientific disciplines, inclusive of SAE or even various academic institutions, especially in the field of automotive developments.
Also: the main subject of Hydrogen Economy prevails throughout the entire course of this discussion, which concerns me right from the beginning.... (yes, there's 2 sides of the story here at play)
Reference:
Physics Today July 2004:
http://www.physicstoday.org/vol-57/iss-7/p47.html
Energy Conversion and laws of thermaldynamics:
http://www.uwsp.edu/cnr/wcee/keep/Mod1/Rules/ThermoLaws.htm
Lastly, Hydrogen Economy by electrolysis and such:
Topic: "why a hydrogen economy doesn't make sense"
http://www.physorg.com/news85074285.html
Bottomline: pure hydrogen as a form of energy for automotive sounds promising, but a mixture of HC with Hydrogen gas (or brown's gas, HHO, etc.)to reduce NOx tends to be a bit on the far-fetched side of things for you still cannot resolve the fundamental problems of non stoichiometric form of burning (which means incorrect fuel-air ratio) that can still lead to excessive CO production (rich/lean or misfiring), CO2 (ideal combustion but a byproduct of burning HC) or NOx (ideal combustion but NOx is inevitable). Expensive and complicated catalytic conversion of these gases is still required and the rather crude and un-disciplined electrolysis can and conversion into an existing hydrocarbon burning EFI gasoline/diesel automobiles from the original poster's site still sounds too good to be true.
That also reminded me of one of the Mythbusters episode where the guys introduced Hydrogen gas into the carburettor side of a car, and it didn't work very well.
My 2 cents worth. This subject is becoming more and more interesting....