An interesting project good luck mate
It’s got nothing to do with AFR’s James it’s about flow rates what you should be asking is why twin injectors would give more bhp than one correctly chosen injector.
F1 engines don’t use 2 injectors anymore despite the fact that they are not allowed
but they do use up to 100 bar fuel systems, as fuel injector and pump technology has caught up so have the flow rates they can produce so it’s a fallacy that two injectors give more power, which is what it’s all about be it normally aspirated or forced induction.
For sure if you want drivability and economy go for two but don’t kid yourself it will give you more power unless you going to use a lower specific weight fuel than petrol
