What I could tell with mine was less down shifts from OD when pulling a hill. It seems to hold speed alot better than before. When you really put your foot in it , she seems go pull quiet a bit harder. As of horsepower #'s I dont think there are huge gains. But the SC seems to make the power the 5.9 makes alot more smoother and usable. I really think it takes the right combination of parts to make our trucks better. There is no 1 magic part for super horepower, but a combination will really perform well. Thats why I will be going with the Fastman TB, header combination for the engine side and 4:56 gears for more use of the power. I know I could break into the engine and do head work, cams, and maybe a little higher compression to be over the Hemi power range. But why break into a perfectly good motor that will still out pull any gas Ford, Chevy, or import truck out there?ROLLAND03RAM4X4 said:hey, what gains did you see, or feel i should say out of your SC tuner? There are many different thoughts about it on this site. Thanks!