you will need a tune so get one. its that easy.

 

If it was Lingenfelter stuff, they usually do their own warranty, not GM.

 

These new trucks are on the Global system so once flashed there's no hiding it even if truck is flashed back. Granted really the only time this comes into play is if you have a major failure puke a engine, trans, transfer case or diff for normal run of the mill bs warranty stuff most guys will never bother looking because it's time out of their day they aren't getting paid for.

I as of yet have not had a major failure on 14 truck as of yet and have not had to do a tune history so I cannot comment on how picky they are going to be but soon as I do yall will be the first to know. However for the first few years of a platform they are usually picky picky because they are looking for field feedback on how to improve or leave alone a product line.