Originally Posted by MrFatbooty

Exactly: fuel injectors are only designed to flow a certain amount of fuel. They work on a principle called duty cycle. Duty cycle is how long the injector stays open. The fuel pump pressurizes the fuel rail, and the injector opens for a certain amount of time. How long it opens determines how much fuel goes into the engine. The extra fuel goes back to the tank. Upping the fuel pressure means that you might be able to squeeze a bit more fuel out of the injector for the same given duty cycle, but not much.

Now, GReddy generally speaking makes their kits pretty complete and reliable in terms of working properly with whatever fuel system there is. The GReddy kit for your car comes with a preprogrammed e-Manage piggyback computer (kind of like a VAFC) that supposedly works just fine with the stock injectors. Assuming that this kit only adds about 60 hp or so I'm willing to believe that, since the ITR uses the same injectors.