I didn't have to adjust anything on mine. It just shuts itself off after a minute or two. As far as feeling a HUGE difference in power, it's not gonna happen. We're talkin' 30-ish extra ponies. At best. You should be able to notice a difference in power and driveability in a few days, but it's not gonna rip your lips off or anything. What I noticed the most was HOW the power is delivered, it's much more linear now, and the shifts are much improved. I also love being able to kill TC and MDS, it was almost worth the cost for that alone.One more question after I turn the truck off take the key out the tuner stays on. Is there a way to correct that or do I have to plug it in and unplug it every time I drive?