Hi. Ive got a 3.4 with the black supercharger. Over the past few months, Ive noticed a drop in boost pressure from a solid 5 psi to about 3 psi and I can indeed feel a loss in power. I have no vac/pressure leaks and the truck runs fine otherwise with no CEL.. I have almost 95k miles on the supercharger but I dont think its possible that it can loose boost with mileage/wear..