My understanding is that from the factory, the ethanol content is derived via O2 sensor feedback and the is what Livernois uses for their flex tune. Other tuners, like Dusterhoff (I think that’s right) use a sensor like this to determine the flex fuel. I am not running flex on this setup, I have separate tunes for different fuels. It’s not as convenient as flex but I run corn locally and switch to 93 if I am going on a road trip.
as for the pulley setup it’s a IW 9% lower and griptec 2.75 upper but on a built 426 so I’m only seeing 13 PSI of boost. I don’t even know what this thing would be like with a bigger blower. 🤯