I put a dual bap on a '13 a while back and id 1300's and it made it to around 800 on e85 before the fuel pumps wouldn't handle it. Ended up just swapping in that ford racing fuel pump kit with the bap/id's and stopped around 850 with room to grow.
I just got my car dynoed on E85 because my tuner basically gave up and ignored me on the 4th revision of my tune. I talked to a local tuner and they told me I had the foundation for E85 and all I had to do was switch my filter to a stainless steel one. So I did. My only fuel mods are ID1000's and PNP dual boosters for my pumps. Car made 663rwhp and 683ft lbs of torque on a Mustang Dyno. So on a dynojet in theory it should be well over 700rwhp. I have same mods in signature but only changes were 2.4 pulley 67mm TB and port matched inlet to vmp tvs. Car runs like a raped ape I am at 20.5 degrees of timing.