Hondata

I was told 440cc injectors are good to about 350whp, but that page says 550cc for 350fwhp (flywheel horse power)

why is that? because of the lower fuel pressure or what

i'm not trying to skimp on money, just wandering if it was still needed,
my fuel set up is going to be
225lph pump, fpr, 440 cc injectors, I just wasn't sure if using a hondata would require still having to have the pump and fpr, thought maybe that was just for cars using a fmu

using a hondata and 440cc injectors, do I still need a high flow fuel pump and an FPR?