What do i need to run full e85 on tune?

[papertowel]

I currently have a 2013 regal turbo premium with the triffecta tune on it. From factory i am able to run e85 in the car but the tune recommends running at most e47 since anything beyond that the stock fuel system can't handle. I was wondering what mods would be required for me to run full e85 and what kind of power gains I could possibly expect if anyone knows. Do I just need the upgraded fuel pump or is there other parts that I need for it to work? I am also looking for recommendations for discreet and easy to install power mods so if anyone has any suggestions for those that would be nice. Another question i had is if running full e85 would be to much power for the stock power train to handle (the lhu engine with the auto) and what the stock power limits of those are. If anyone could provide any information on this that would be greatly appreciated.