Gentlemen; been following this thread with a lot of interest. The rig HHO unit linked earlier in this thread was $995 bucks and cranked out 2 Lpm. If 2Lpmt makes enough of a difference, then our generators don't really need to crank out mega Lpms to see results. This site I found has three designs, I built the one the first one and think mine makes a little over 1 Lpm, maybe 1.5... I haven't got it in my Diesel X yet, but I should soon... let me know what you guys think of these designs... http://www.free-energy-info.co.uk/Chapter10.pdf