i heard that Banks is working over time to release one for the LMM and hope to have it in the next month or so..yes PPE has one avalible for the LMM that will give it up to 400 smokeless rwhp,and EFI Live is avalible..
It could and in most cases the dealer will...but, if you make sure it is removed off the truck before you take it the dealer...then you should be ok. The dealer (or GM) has to prove that the programmer caused the problem. Most people go with the "out of sight, out of mind" mentality. Just don't try to claim warranty on things that you caused by using the programmer and you should be OK. (that's my dealer's stance on programmers, at least with the truck I already own) BTW, welcome to the site!