I am saying that as of 2 weeks ago the DI pump and fuel injectors are not an issue for around 500WHP or possibly more of 91 or 93 gas from my tests without falloff of the DI pump pressure.
After I put in the dual ITFP setup I saw 2200psi on the stock fuel system at WOT with no lean issues using stock pump and injectors, the aux fuel injectors were unplugged. This option will be expensive however as the dual ITFP itself is around $780.00 + around $200 in fittings and a $300.00 fuel pressure regulator + it's a bear to install.
I'm looking at the stock F150 5.0L ITFP as it's rated for 360HP on E85 over 500HP on E10 gas. Lots of guys running new trucks and mustangs at around 600HP on stock pump. If we can get the lift pump to keep up pressure to the DI pump we should be there. This should be a plug and play pump with no wiring changes, you could add a BAP on top of that if you wanted.
Vishnu on the BMW side has installed an inline fuel pump in the tank that let's them see 700HP on the stock DI system. I'm taking to the people that make their pumps to check out our platform as of this morning.
I'm trying to get the fuel upgrade side around $600 to $900 to support the 600WHP of the turbos without meth, you can add meth as desired after that.
But yes as of 2 weeks ago your information is now dated, sorry man, I'm staying on top of the platform and doing more and more tests as time goes on.