im looking for an upgrade from my current stock S4 turbo,manifold,wastegate setup not looking to spend very much or a huge HP increase. i know the S5 setup is better than the S4 for creap and exhaust flow wise, so one of my questions is:

Is it worth it to swap all of my S4(manifold,turbo,wastegate) to a S5 setup?
- im looking to run a solid 10PSI.

or is it easier cheaper to just port my wastegate on my current S4 setup?

my only concern with this is i think my turbo might be on its way out.

and the last question is if i were to swap everything to S5 what is all involved like is it a direct swap, ive herd you might have to change up the oil connection or coolant connection to the S5 turbo???

and will is conflict with my S4 ecu or anything like that, i have a walbro pump full 3" exhaust and a FCD. so my setup should run fine with a S5 setup at 10PSI so im just looking for some info and suggestions, anyone done this before?? maybe a t4 turbo is cheaper and more efficient idno. lemme know what ya think thx alot....