Here is a simple video explaining it way better than i could ever do for you curious out there. Since my low side 2 years ago it is just a tiny bit fiddly to find neutral sometimea. Nothing really serious but i'd give this thing a go,
Concerning 929 injectors and fuel pressure I've leanred in another thread by Mohawk that pushing the stock FPR to max achieve 44psi or 3.034 bar.
Can the stock 5th gen FPR do the job finally? If not does the 919 regulator even fit or i'll need to do a similar setup than Mohawk shared?