tuners

I see a lot of guys making 50hp tow tunes, 80 hp tow tunes, 150hp race tunes and so on, so how do you know the HP for the tune when you create it? Is it just based on what you know a truck with similar modifications has will do or is there something in EFI that tell you this? Thanks Matt

Hi everyone,, I am new here and am wondering where on the site to find info on what the difference between the Edge tuners and EFI live and which will be better for me, I would like better MPG but like to punch it once in a while. Also I am wondering why you need 25 posts to request a VIN check...