Have a 2011 Fltrx, been having a lot of top end noises. 29000 miles. Went for a ride to Illinois a few weeks back and the noise got real loud. Made it back home no problem, got the bike into the shop and they said it sounds like a bad lifter. I have a 204 SE cam in the bike, they said with cams, lifter only last about 25000 miles and it’s regular maintenance to replace them. Went and picked the bike up this morning and it like a new bike. Never heard of this before, but something to keep in mind for the future.