B20b t3/t4 50 trim turbo tuned on 14 psi has mbc on it. Car has been running good. When I went to drive today maybe been driving 45 mins got on highway. When i went into boost it only went up to 6psi at most on my gauge and won't go over that. Never happen before after inspection Turbosmart wastegate bolts was a little loose. I tighted them up still nothing over 6psi. Can anyone help me out? couplers are fine dosent seem to have any boost leaks.