Originally Posted by Evil///M
No, it adjusts the timing and boost correctly according to the ethanol content. Fuel pressure will always be constant.
A reflash is part of running the flex-fuel kit.
I think you've misinterpreted what I meant. The piggyback fuel volume limit is defined by the largest constriction in the hardware, be it health or the combined upper/lower limits of each individual component. Two people could have the same mods and piggyback, one person with trims at 20% and the next person pegged at 34%.
I didn't know that the FF kit also came with a flash. If so then you shouldn't have an issue with OL fueling. It seems like they have adjusted it moreso with their latest flash to keep trims closer to zero.