Just installed Fatshots with 8 discs on my 09 Road king, along with SE A/C and PCV from Fuel Moto. No louder than stock (which is what i was looking for), and running great. Haven't worked on a car or bike in 30 years, but install was as easy as everyone says.
I had them on my 107 UC with 9 disc's great deep sound,when I used the V-Tune on my TTS tuner it increase the VE quite a bit over the CVO mufflers I was using. I have them for sale here now,they were only used for 400 miles. We both like the sound of the 09 mufflers so I selling the Fatshots.