im in the same boat, i have a vmp bap plug and play and shaun told me the same thing needed to run e85.
That is what sparked the conversation. I emailed a highly reputable performance shop in So Cal for an estimate to install a return style fuel system and he told me it is not needed unless I'm going for over 750 hp. He and my tuner both said I'm fine with ID1000's and a bap. I have been back and forth a few times with a bap vs. return style fuel system to run E85.
I'm not trying to start a shit storm btw fellas.
If you're at the point where you need an extra 4 volts to not have the fuel pressure plummet you need a fuel system.
I'm with beef on that. This is what we designed out budget E85 system for.
Whichever reputable tuner you decide to go with, seems like you have chosen AED, do what Shaun says to do. Of course all of the vendors on here are going to tell you to buy a fuel system, why wouldn't they. Any fuel system can fail whether it's a stock system with a boost-a-pump, a budget E85 system, or a full $2,000+ return style system. If the system you choose supports your mods and horsepower level then you are fine. Get a fuel pressure gauge so you can monitor it.
Honestly it's not about the money being made we're just trying to give you good advice.
I personally don't like to be on the ragged edge between making power and melting all of my pistons.
But that's just my 2 cents lol