Im worried what the removal of that screen would actually do to the pattern, if I got ahold of a spare set I wouldn't mind hacking em apart and just log the AFR with the TXS tuner just to be safe. I just question why subaru would restrict the same set of injectors differently (STi and WRX) I would have just run a 740cc injector and pulled the duty cycle to simulate a 440etc and have the extra capability of fueling if an emergency situation arose, unless its just to pair it with a lower fuel pump for price on that