I fully understand a warranty. I don't understand that if a truck is out of warranty then tuning is ok but under warranty it isn't advised. If I tune under warranty and something breaks I'll have to pay for it but if I wait till the warranty is gone I still have to pay for it. I guess you just don't understand what I'm saying. In the past I've always tuned stuff or added superchargers and the such under warranty but nothing that was going to cost me as much as this truck if I broke something. I always knew going in what I was getting in to. I didn't wait for a warranty to expire. But I can't afford to replace this motor now or when the warranty runs out.
Im trying to understand your question. If you tune under warranty then your warranty is probably going to be voided in the event of a major break down. If you tune out of warranty you will be liable for the costs of a major breakdown regardless. Now, the reason people wait until they get out of warranty to tune is to cover their asses financially for the maximum amount of time.
Now, if you cant afford to pay for a new motor etc, then dont void your warranty, and when your warranty runs out, get a new truck that is covered by a warranty, buy an extended warranty, or buy a car that you can afford to fix in the event of a catastrophic failure.
Basically the bottom line is that tuning the truck makes it run better, but you void the warranty which is a risk. If you are already out of the warranty, then many would argue that you are lengthening the life of your truck by tuning it, and you now don't have the risk of voiding the warranty. Either way the general consensus on this board is that tuning lengthens the life of your truck, no matter when you do it. That does not mean that a tuned truck is indestructible, and once you tune, you are probably going to be held liable for the repair costs warranty or not. Hope this helps.