What I have seen after installing the boost controller is this. Without the controller my turbo maxed out at 7 pounds according to my boost gauge. When I installed the controller and set it for 12 pounds I now see between 8 and 10 pounds of boost when I am running down the highway. Granted this is at 80-85 mph but it makes a big difference as opposed to the 5 or six pounds I was gettiing before. Now I can actually pass cars going uphill