so i discovered that when the power stops at 4k if i back off the throttle and get back on it i get all the power back, so im thinking it is the N75 because when i back off the throttle the boost drops and then i can get my power back when the N75 closes. what yall think?

 

First off I know how you feel with this, but you don't need to make 3 seperate threads on the same thing.

I don't even own an S4 yet.. But I would say it's very possible that it could be the DV's.. Just get the upgraded DV's since your probably gonna do that anyway, and see if it helps. Can't go wrong really.