is a stock d16 intake manifold capable of supporting 400+whp or should i go with an aftermarket intake, is it worth buying a Blox manifold or spend the extra dollars for a Skunk2 or other well known brand?

i have the same question about the stock fuel rail and regulator, are they capable of supporting such power goals?

i'm currently running a vitara/eagle build with RC1000's, a walbro 255 pump street tuned on 15 psi of boost from a .57trim T04E. i have a goal of hitting at least 400whp and i plan on a head build and oversized vitara's