The 2 biggest chances I've noticed is the truck is more responsive and the shifts are very smooth. It doesn't have that short lag when you floor it. Justin does a good job of getting rid of that. And when I get on it, it shifts incredibly smooth. I can't tell if it's anymore powerful. I mean it's a 6.2L with almost 400 HP so it had a lot of balls to begin with. I haven't noticed any gain in gas mileage either but that might be just due to my truck. I tried a couple other things and nothing.