I gotta ask, why does everyone want to wait until warranty is over when the things warranty will need to cover will almost always be the things you are going to delete and make stronger? Why not do it early so that once the truck has a lot of miles, it has already been running clean and has a good base versus starting after warranty with a motor filled with soot and that ran hot all the time to burn itself? Your warranty will still be active and work for things like the interior switches, radio and basically every other little thing that is usually a culprit of a dealer fix.