The 4.0L engines don't have the capacity of the 99-04 engines and the 3.8 SC, because the parts aren't as durable. The heads are suspect and the rotating assembly is a lot more fragile. -Specifically the pistons, the rods and the crank are pretty good.
you can't run a lot of boost, N2O, or otherwise, without running into trouble.
The engines are a lot like the 94-8 3.8L Mustang engines in that regard . ..
Woe to him who builds his palace by unrighteousness,his upper rooms by injustice,making his countrymen work for nothing...Does it make you a king to have more and more cedar?Did not your father have food and drink?He did what was right and just,so all went well with him. He defended the cause of the poor and needy,and so all went well...But your eyes and your heart are set only on dishonest gain,on shedding innocent blood and on oppression and extortion. Jer 22:13, 15-17