Hi,
I don't have all the P/N's with as I am at work. But I will do the best I can, I currently ride a 2008 FLHX. I have two Roadkings prior of which the first was a science project, too many hands and opinions for what to do. First I think is most important decide what kind of ride you want, for me a it'a a tractor motor with killer torque. I sat down with the dealers PHD tech and we picked from the SE parts list only thing out of family is the G570 CAM (gear drive) from S&S. I also went with SE heads in an effort to try to match the flow capability the CAM provides. Also Roller rockers, keeping the valve train light makes for a very responsive throttle. I stayed with SE slip on mufflers, not the CA models but they do have an EPA stamp. I live in Denver and they are checking, places I ride to are also getting picky on noise. I found out on the long road Thunder Headers can really be a pain (first bike). So, I am sure I have lost some HP with that muffler choice but I love the ride. Remember I live in Denver so we lose lie 15% off the top but I believe the Dyno had me at 90HP and 101fl lbs.
Tapp