Jake, some argue the stock fuel rail starves some of the cylinders once power is being made. For instance, the rail is feeding 6 cylinders, the first 5 from the feed line are going to take alot of the fuel and starve the #6 cylinder. Thats why most aftermarket rails are a dual feed, single return to help eliminate that.
Most folks spend good money on a turbo that can support 700hp and the pump isn't safe (to me at least) over 550hp. So now you have a turbo kit you can't use to the fullest. So thats why i mention lack on the fuel department.
Its personal preference