im a chevy guy and dont know much about the 4.6 engines but im looking at getting an 05 GT and i was wondering what the weak link is in the engine?? is it the cams? compression? heads. intake? or what exactly? any insight on what someone else has done and got noticeable gains would be awesome! im asking as far as internals.. i know you can do the bolt on stuff like cold air and full exhaust.... so again any help on this subject would be much appreciated!