Evenin guys. i've searched and couldn't find any leads. Here is the issue.
I have a 02 HO. Autometer gauges. When it was bone stock, i made 21psi. I put a K&N drop in filter in it. 21psi. I put a Superchips tuner on it. 21psi. I put a boost fooler & a boost elbow in it. 21psi.
Under...