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Generally PI is recommended for race gas or E85. However if you dial injectors way back you can use it on pump gas to help the HPFP which on our N55 is the weak point. You will need PI or the new xDi HPFP when going PS2 if you want to run more then 15psi on a custom flash. And to make 500 wheel you will need more then 15psi.
Im currently running an M235xi N55 FBO/PS2/Fuel It PI/ AIC6 controller. I am full custom flash with Bootmod3 91OCT. And we added the PI with injectors dialed way back to help the HPFP which was even struggling on 15-16psi mainly after 5500rpm WOT. Adding the PI def helped and car runs smooth to redline on 91 with peak boosts or 15-17psi. anything more and your fuel is the weak point and knock becomes concern.
Your question 4. Adding PI is the band aid to supplementing your HPFP and was the only thing available until recently.. Your new and other choice is to forego PI and buy the xDi HPFP. Its fairly new but is the way to go going forward because this actually replaces the stock HPFP and will allow you to run E85- race fuels no issue. Bootmod3 is also setup to use with xDi integration. Im guessing MHD would have no issue using this too.
I do have a stg3 LPFP and if your looking to run 500hp and PS2 and add PI or xDi then it it only makes sense to have the LPFP upgrade. A stg2 LPFP might be all you need so double check.
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