If its tuned for the injectors, it wont make any difference in power. That would only be true if one injector was undersized. Basically, within the limitations of the injectors response time vs the minimum pulsewidth at idle, its not really possible to oversize an injector as long as you can tune for it.
For a 21# vs 24# injector, the difference in pw will not be very significant at idle, and it will be even less at WOT - perhaps a few tenths of a ms. even an injector twice that size would work fine if it responds fast enough (and actually, a large injector is easier to time precisely than a smaller one).
For a 21# vs 24# injector, the difference in pw will not be very significant at idle, and it will be even less at WOT - perhaps a few tenths of a ms. even an injector twice that size would work fine if it responds fast enough (and actually, a large injector is easier to time precisely than a smaller one).
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