Your truck is already quick enough I think. Headers would look good and sound good but waiting that long is something I couldn't do... lol I say go with the brake rotors because of the points you brought up. It'll help the show aspect of your truck and that is more what your aiming for anyways. Fast is definately fun but unless you start getting into cams and that sort of thing, headers or the throttle body won't really be worth it in your case imo. Go for show
