I don't trust ANY "kit" or modification that is not approved by the manufacturer.
I especially don't trust things like this.
And until we start running out of gasoline, there is no good economic reason to do this anyway.......because the ethanol has a LOT less energy density than gas.
Because of that, most owners of flex fuel cars still do not use E85 because the cost per mile driven often ends up being higher.
Octane rating does NOT equate to "better" anything in fuel.