I know the manufacturer and have one on my 98EV. I did some R&D for these guys, used to be 2 partners now 1. There is another one the same out there from Nevada, different package only.
I opened my intake & exhaust so I contacted them. It works if you set it up correctly. I had miles of strait roads in corn fields.
All it does is add pulses to injectors at a certain time. It was for no O2, don't know about CARCs on it. It does nothing to the timing, only adds fuel & does not subtract any from stock.
Mine is set-up perfect, ask anyone who's ridden w/me.