Here's what makes your car go vroom-vroom. This is half of the equation to make more power (the other half being air). It wont take long to push the limits of the stock system when you start adding boost or a bigger engine. An important thing to remember with fuel systems is that you can always make a low amount of power with a huge fuel system (with any solid engine management), but you can only make so much HP on a low rated fuel system. XAT Racing strongly recommends not surpassing 85% injector duty and fuel flow ratings to stay safe within the range of power you're looking for. Keep in mind it's MUCH less expensive to go with a bigger fuel system that is more than what you think you need (for a little while at least) than to blow up your build trying to push the limits of an inadequate system.