What would happen to a stock exhaust on 03 f150 when i put a flowmaster exhaust on it will it hurt the engine?

Im thinking about putting one on my Truck. But im not sure what it would do. Do you think it would hurt it any?|||If you just do a cat back setup your engine will be fine. and your truck will sound/look better, and maybe have a few more horsepower.|||A Cat-back system will not hurt your engine or your performance,


it will make your truck sound good though...