@Thor2j
Ford and most car manufactures will essentially over build their cars if they're smart. If the motor and other components limits were 500hp and they sell the cars or trucks with 500 hp theres very little margin for error... possibility for a lot of cars to break, in turn a lot of warranty work for them to cover.
Example, you can throw twin turbos on a new mustang GT it'll make 1000+ hp on a stock motor. Ford sells the cars making about 460, yet the motor can take 1000+, however at that point you're definitely stressing the motor. Find a middle ground at around 700-800hp with a supercharger and the motor isn't being stressed, it'll be fine. The Cobb tune is adding power, but also being very conservative. No where near enough to stress the motor to the point of "premature wear".