I don't know about all that?

I managed to find a technical installation document on the net, now, for this particular unit, and they pretty clearly claim it works with your stock injectors. That's how it seems to hook up... mated directly to the 6 fuel injectors, plus another set of wires for power/ground.

It claims it works in conjunction with your existing engine computer and factory components, but simply increases the injectors' pulse width beyond what's programmed in to the factory computer when it detects E85 fuel is in use.

I'm pretty sure this thing isn't helping advance your timing to make more power from the extra octane, so much as it's just designed as a safe way to run on E85 for "environmentally friendly" reasons and maybe some small potential cost savings on the fill-ups.

I found out, too, the unit has a potentiometer inside you can turn to settings between 1-10, and apparently, a setting of 5 is the factory default and recommended "for 90% of vehicles on the road". But they specifically say if you're getting codes about the fuel mixture being too rich, to turn it down to 4 and try again. In my case, it was already turned all the way down to 2. To experiment, I turned it to 1, and my car started idling weird (occasional surges), so I changed it back to 5. Now it's idling and running normally again -- but guess I'll have to see if the CEL comes back or not with more driving.