Throttle body, yes, better intake yes, injectors, no. They are not operating at anywhere near capacity, so if the engine needs more fuel the computer will make adjustments. My SRT6 with a stacked pulley setup, SL55 pump and AE regulator didn't need bigger injectors. The numbers from our vendors are best case scenarios, you usually don't achieve the max estimated result but as long as it feels stronger and you are happy, the numbers don't mean anything.