Hello the name is Kamil. I got a 2016 colorado crew cab long bed diesel about a year ago. i have had DEF issues with it and i want to delete it and all the other emissions. I've been looking around at tunes and the only tune i found was the PPEI tune that allows for deletes. but I've seen some people got some other tunes and my question is how do the tunes you guys got effect the deletes. and also i can't find anywhere that if you straight pipe the truck then what happens to the DEF system. I've had issues with that system when it was stock. does a tunes delete the use of DEF ? thanks for any help in advance.