Ok my friend took his truck in for a seat belt issue it is a 2008 LMM Flashed back to stock before he went in GM has voided all future warrenty work due to having a tune in the history. The Service manager said they are checking every LMM to see if there is anything in history they are voiding all warrenty l guess that mean no more tuning the LMM OR YOU WILL KISS YOUR WARRANTY GOODBYE