in any induction setup what you are trying to create is laminar flow, for which their is three elements, viscosity, velocity and geometry, the two we can influence are velocity and geometry, the easiest to address over standard is geometry, the standard item has a resonator box which is there to tune the induction sound, it will however create turbulence, this sounds bad, but the diameter of the induction hose will have been specced to allow allow for this loss anyway, next point velocity, we can increase velocity by having a free'er flowing filter, again the standard system will have been specced for the total air requirement the engine needs, if the standard filter wasn't up to the job it would suck the inaction hose flat, which it doesn't.
so in summary you are not going to make any gains from an aftermarket induction setup, in modern day cars the induction setup is incredibly well thought out.
So why bother"upgrading" and I use the term upgrading loosely, as mentioned before there will be little to none performance benefits, but what you can gain is sound, which for me is what a big V8 is all about, when you look at any performance car they try to balance the sound of the exhaust with the sound of induction, I have a noisy exhaust, so I want a noisy induction, which is why I am developing my own induction setup, which will include a smooth radius silicon elbow like Dans