To delete or not to delete ?

From experience here working with manufacturers and extended warranty companies, doing inspections for 11 years on anything with an engine. You are setting yourself up for headaches if you delete. In the short term you may save money but in the long run if you don't run the truck until it is dead, and have the carcass eventually taken to the junk yard its going to cost you more money at the end. When you go to sell your truck, it is illegal to sell it to anyone with a modified emissions system. And fines are very steep now days. If you trade it in, the dealer weather it is a used dealer or new dealer must have the emissions system all intact when reselling. In many cases keeping your old exhaust system isn't all that is needed. Def injectors quit working from sitting, egr valves seize up from not moving, nox sensors get corroded from not being heated, Def pumps quit. So even after the dealer installs your old exhaust they end up having to replace much of it just to get it to work again. Which in turn costs you lots.

My suggestion if you plan on trading or selling the truck in the future don't delete it. Or understand when you do go to sell it and move on its probably going to cost you lots to fix it. Or wait until there is an actual problem with the system then decide weather it is worth it to fix or delete at that time. Unless you are having fun wuth your truck and willing to spend money on it as a hobby, just leave it stock.