Bigger injectors with head/cam swap?
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It doesn't necessarily add power like others have mentioned, it is a matter of providing enough fuel for your air consumption of the engine and the tune in the computer. if your duty cycle is 100% and you are running 13 AFR WOT, then yes, putting in new larger injectors and tuning it to 12.5 or something depending on your setup would net you more power.
ALSO, keep in mind people also upgrade fuel pumps... the 255 L/hr pump is only good for a 51 LB injector...other then that you would need two pumps of some combination