First off I have an 08 regular cab with the 4.6. I used to have a superchips cortex on it, and i thought it was fast then. I took it off and gave it to my bestfriend, but then I was left chipless. So I ordered and SCT for my truck, so much better now. So far what I have noticed is my truck has hit puberty, no more waiting for the power. I'm lovin it