First off hello im new to this forum and new to tunning with efi live by myself i always had it done but i wanted to get more hands on. i have a 2003 lb7 with a manual trans and im trying to tune it i got the stock tune pulled off and saved and i am wondering where in the hell do i start i have absolutely no clue i looked at another guys tune for an lb7 and i find myself just changing numbers to his but i wanna know what exactly i need to change reasons why to change it and how to change it like i said im new (when i say new i mean i had to read on how to get the dang stock tune off the truck new) but i am willing to learn as much as possible and from reading around and looking at posts you guys seem to know your stuff. any help is greatly appriciated thanks in advance