As a new owner of one of these trucks I am very intrigued with the GDE tune for all the reasons that are very well represented here. I have one question ... has anyone had a catastrophic failure on a tuned engine? Being that mine is brand new if tuning will prevent failures that is of interest to me. I would like to hear your opinions...thanks. BTW...I am an ase master tech and plan on doing all my own service/maintenance. It seems that preventing soot buildup will greatly increase the engine life.