Taking a look at the above photograph the just take off heading straight down on all four ITBs is the outlet on the small gap just by the throttleplate (on my ITBs there is not any vacuum there - i.e. worthless) I read through on-line that when they are not https://4age20vblacktop25925.nizarblog.com/34801347/what-does-4age-20v-blacktop-mean