the 6.5's? if you try to make some serious power of out them yes, but running around 30 psi of boost, 4 inch exhaust, intercooler, computer upgrade, and headers wouldnt cause that problem. i'd have to run an extreme amount of boost and other upgrades to do that. mostly i'd be worried about increasing the gas mileage and the torque, not to hot rod it, but for regular towing and crawling.
wait, nvm, i wasnt even payin attention to what u said, sorry. they are prone to cracking around the injectors stock, but if i do drop one in my truck i'll upgrade the head to prevent that from happening.
