2013 Supercrew 5.0 XLT. Have read the main page about mufflers, now just more confused. Muffler shop said use #11229. Thinking I'm going si/so using my existing pipes. Is this the right muffler. Want that thwart with little or no drone. Also thinking about keeping the resanotor on to see if I like the sound and if it breaks in any. Can always remove later. Any help would be greatly appreciated.