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In fact, if you did have any extensive mods beyond the basics, such as cat-back exhaust/intake, that's when the handheld wouldn't be the best route and you'd really want to look into a custom tune.

I have the 5.3 and so far I added the VOLANT AIR INTAKE SYSTEM, which by the way woke my truck up out of it's sleep all on it's own... anyway, you are saying with the intake and full enhaust (headers back) that a programmer would NOT be a good idea? and for the lack of knowledge why?
 
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