MAF could care less so long as you are not spraying the fuel over it damaging it over time. it does not affect CFM it sees.

stock ECU will be happy so long as the aux injectore is tuned to follow boost properly ... which will maintain the AFR the stock ECU expects at part throttle and the richer 12:1 ratio at full boost which the stock ECU will not affect as the stock narrowband o2 sensor is only accurate at 14.7:1 so the stock ECU does not look for lambda correction at WOT.


auxillary injectors so long as chosen carefully for their spray pattern and used with high enough a fuel pressure do a decent job of equally distributing the mixture to each cylinder unless the intake manifold is of crap design ... such as on the turbo 2.5 dodge motors we used to run many moons ago that had a uneven air distribution resulting in the spark plugs showing different temps across the cylindesr (this is how to check your system is running correctly, spark plug reading, EGT or wideband o2 per cylinder is the easy expensive way to do so). So a single high quality injector, injector holder, wideband o2, megasquirt 2 for on the fly wideband correction ... ticket to ride in my book.

if you need a much more elaborate solution you should not be looking for a 5psi simple entry level system ... if you are ... you're going overkill.