ok heres the deal. i have the greddy 15G kit. i recently put on a small greddy FMIC. i used to hold 5.5psi, but now it dropped to like 3.5 / 4psi now. i this normal?? i just want to make sure. ill be putting on a turbo XS mbc this weekend to turn it up to about 7psi.

 

mine dropped too but come to find out, one of my rubber connection was loose. pressure drop will occur on any IC. a turboXS MBC is a good move. i have one. you'll be amaze on the difference even at 3 psi!

 

Yes it is normal if you have the vacuum source for the wastegate hooked up to the turbo.

-deepsi