My buddy installed the FM 107 kit on his Road King and I can attest as I've ridden it a few times, it is phenomenal.
I've purchased FM's ceramic headpipe and their 4" Jackpots and I'm very happy. Customer service is excellent due to the multiple times I've requested maps as I tweaked and installed other performance components (SE-255 cams, etc...). Who else do you know has map profiles for the countless performance combinations we can install on our bikes.
Now that my RG is out of warranty, I will be pull the trigger on the 107 kit in a couple of years. Will ride my bike to Jamie's shop and since he's going to split the cases, might as well have the heads done too. I'll just go to Milwaukee for a couple of days and visit the HD museum as he is working on my bike.
11 FLTRU with FM ceramic 2/1/2 headpipe, Jackpot 4" Dyno Tuned Slash Up exhaust, A/N Derby Sucker, PCV, and SE255 cams =