I am planning to buy a programmer soon and I have asked alot of people what ones are better for my truck, I have a 04 5.3L 4x4. Most people are telling me edge makes the best on the market but I want to ask on here best of the vast amount of knowledge of the people on this fourm. Also I have heard alot about "custom" tunes, is that where you have someone add to your programmer or are they calling have a programmer a custom tune?