what size engine you running? what mods have you performed? from what i have come to hear, stock your not gonna see much improvement, if you went up from a 700 to 780 it will add a little kick and make things easier to dial in, but when you start to get into the bigger breathin beasts is when it comes into play really. 700 - 780 use the single dial-a-jet and 800-835 use the dually dial-a-jets. don't hold me to this, but i have also asked around about these and thats what i was told and thats what i have read. just my 2 cents. thanks!!!