vacuum leak

I have a boost leak somewhere and I can't for the life of me find it. My numbers on the dyno came back much lower than expected at 716hp with a 3.875 pulley. I finally got around to hooking up my boost gauge and found I'm only making 8 psi. The kit said it should be making 10-11 psi. I tried...

Hi, New to this forum. So, my mustang gt 2018 vacuum gauge shows around 21 at idle, which I think is fine. But when I am cruising and then I accelerate I get some hesitation and noticed that the gauge reads like 5 then stays at 10 to 20 afterward. Is this normal, do you guys have any idea if...