exhaust header surface temps ALWAYS hotter than EGT(exhaust gas temp). so-called "tuners" say they like to see EGT of approx. 950-1050 degrees fahrenheit during fairly moderate engine loading for both sportsters and v-rods. this is measured center-of-pipe and 5 inches or so downstream from the exhaust port. NO reason buell XB temps should be much different. i can't think of a conventional riding or atmospheric scenario that would yield header temps even approaching what you listed. you should be fine with either color.