i have a greddy kit on d16z6 in 81 hatch. At WOT in 2nd it goes to 9 psi then drops slowly to 6ish, 3rd it goes to 9 psi then down to 7ish til redline and in 4th it stays steady at 9......I do have a resonator and a 50 series Flowmaster...........Would that exhaust restrict it that much to lose some boost???? OR could it still be a boost leak?? If so why does it stay steady at 9ish in 4th gear and not others????

 

ttt

 

Turbo SPecs ?