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The better option is to get matched injectors of the same rate that you have now, that will have smaller variances in flow rate. This will give you more even distribution in your cylinders and/or banks, leading to more precise fuel trims imposed by the PCM.
Also realize with increased line pressure, your computer will still command the same pulse width but will actually be delivering more fuel because of the higher pressure. This will most likely require a new tune for the PCM. You will at the very least be running rich and/or have large fuel trims.
Normal maintenance like fuel filter, fuel system cleaner, synthetic oil, cleaning of throttle body, etc. will help make longer term effects. The 65+efficiency mods list is a good place to start.
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