AFAIK, all the FFV motors have the bigger injectors (otherwise they wouldn't be FFV, b/c they couldn't pump the E85 at the required higher rate.) I'm not sure how the PCM knows to react to the different fuel... I'm guessing there is a sensor in the fuel regulator or somewhere in the system that analyzes the alcohol content of the fuel. At any rate, I think that given that you have the bigger injectors, the PCM will allow them to pump at the higher rate any time that the engine requires it. So if you added nitrous or a blower or something, I would think the injectors would "rise to the occasion" based solely on the stock PCM programming.