I put one on my old '02 Powerstroke, it lost a little on the bottom but gained a little on the top. I was making 36 psi of boost with the stocker and then 30psi with the van turbo, which I was much happier with. I sold the truck to my buddy and he put some injectors in it and its now making around 370 rwhp at 31-32 psi of boost. Hope this helps!