I'm planning on switching Exhaust from a donor Lightning to my Sup. Crew 5.4L. And I talked to Ford's Part department about it. and they said that the L's exhaust mainfold is a bit bigger than the one on my truck. And also recomended me switching O2 sensors as well. Has anyone tried this before ? If so what kind of headaches did you get with the switch. Any advise would be appreicated !