you would show a benefit if you already have a way of tuning for the new injectors. along with a fuel system that can supply them. if both of those are already in your car then id go that route.
with tuning+ fuel system injectors and starion will be faster
without; then, not only will the car run poorly, but the evo intercooler would be best.
another sensible option is to mount the starion, and reek its benefits, without buying the injectors, then just wait til you can run the entire setup. at once (EVO: injectors, intercooler, mafs, fuel +tuning)