I don't know about the RCXs making the bike run hotter, but 6 months, 6k miles, no bluing and the sound only gets better. Not raspy like the SE slip ons more of a low rumble at idle. I like em.
2011 FLTRU, Power Vision, Jackpot 2/1/2 header, SE 255 cams, SE adj. pushrods, SE Ventilator Stage I a/c, RCX slip-ons, Heritage handlebars, 15" WindVest, B/R/T conversion kit and more chrome to come.