Bigger injectors (by themselves) have a 0 hp/$$$ ratio. Even if you get a calibrated MAF or chip or whatever. Unless you need more fuel than the stock injectors can provide at maximum flow, you don't need them.
Hypothetical example: Two owners have identical engines that run 60% duty cycle on their injectors at worst case. They both want to richen the fuel mixture for more power (and we'll assume richening will be effective).
Owner A buys a S-AFC (for example) and uses it to richen up at WOT. Goes to the dyno and gains 5 hp after extensive tuning. Stock injectors are now running 70% duty cycle.
Owner B buys a S-AFC, and gets larger injectors to go with it. Goes to the dyno and gains 5 hp after extensive tuning. Bigger injectors are running 50% duty cycle.
Who wins? Owner A, because he can now go buy a something else with the money he saved on injectors.
