Noticed the cossie was a bit slow the other day when I gave it some stick and when I looked at the boost guage it wasn't going past 11psi. As it's stage 1 it should be on about 16psi. How could I of lost 5psi? Should I just wind the boost up or could it be a bit more complicated than that?

Any help appriciated as I'm struggling to keep up with the normal flow of traffic