I thought I read something about them modifying the pump also, but when I bought the replacement, Carl said I just needed to stick it in the tank. Which I did.
I'm making 540 to the rear wheels. I was concerned because I drop some pressure on my gauge as the RPM climb. Well, come to find out, I'm doing the same thing with the new pump I replaced it with, so it may have been a worthless switch for me. My gauge and my Holley both measure the pressure at the fuel rail while the PressureWorks controller I have measures close to the pump. Since I'm seeing the same effect with the new pump (the larger one), I think the pump was fine for my power level (the injectors never went to 100% Duty Cycle, so they weren't maxed out).
Anyway, you are close to the limit as I was, I switched for some insurance if I grow again in the future.