the issue is that a large injector cant be control at a real low pulsewidth. So say you want to idle. even with a 550 injector at a 5% pulsewidth the atomization of the fuel injector becomes less effective. This goes the same for cruising. A large injector will make for a terrible idle and harsher cruise (bucking).
The stock injector is a denso piece and most nippon denso injectors are interchangable. So as stated, that would be your mistu, nissna, honda stuff. The US makes tend to use a variety of injectors that have no common ground with each other.
then there is always side feed injectors.
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