Good god, don't you guys spray your bikes with WD40 after you wash them?
There is no need for spray paints and all that shit. Wash your bike, and about every other ride, hit the pipe with an Scotch brite pad. then spray some WD40 on it before you put it away. It displaces water and keeps everything from rusting. Buy the gallon jug of it at Lowes and use an old spray bottle.
It's your bike, do what you want with it, but I would never spray any sort of paint or anything on an FMF Factory finish pipe.