If it isn't broken leave it, a new one won't allow more pressure as there not on the in line there on the return, and the injector will only pulse so much, bein a vr the map sensor ran, so u would need a bigger map sensor to accomindate more air/ fuel ratio, which won't be effective unless ur running high comp, leave the fuel reg and do the plugs perhaps? Don't bother buying expensive ones as it's the same with spark ur stock coils will only spark so hard and it won't be enough to need 30 plugs, did u change ur filter? If not do so as urbinjectors may not be workin to full capacity with a clogged filter anyway