I was crutching my EFI system before with an aux fuel pump and FMU with too small of injectors because the 24# injectors were all the factory PCM could trim to make idle. It took 160 psi of fuel pressure to get to 700hp! LOL Who'd have thought you could get 4200# worth of truck to go 10.61 @ 133.65 mph with 24# injectors? hahaha (I know, nobody in their right mind would have tried!)

Now with MS3X I run the 66# injectors sequentially at 70psi of base pressure with a 1:1 regulator for 88psi thru the traps.

For my limited experiences with EFI it's been a fantastic opportunity to use a system that more or less tunes itself after you give it some AFR targets for specific rpm and loads. I'm quite impressed to say the least.