My setup :
stock t25 turbo stock boost (7-8psi)
tune by RS-Enthalpy
t3/t4 63 trim on mazworx mani (12psi)
same tune as previous setup (I contacted Martin @ RS Enthalpy and he told me the tune he gave would still be good for 12 psi)
My initial setup ran good.. I have a vented BOV and it ran good never stalled. Now with this t3/t4 it dies after WOT while driving down the road like right after I let off the gas. When cruising it does not hickup or anything when pressing the gas. I checked all vacuum and I just recently cleaned the IACV. I had a stalling issue on the first setup but found my FPR vacuum line was loose, as soon as I put a new line and clamp it never stalled again. I didnt mess with anything vacuum wise when switching setups... The only line I messed with was the one on the bottom side of the TB. I put a rubber cap over the L shaped one which I am under the impression that was a pressure line, not a vacuum line anyways..
2nd is not a winner and noone remembers 3rd.