They are pretty loud especially on a modified motor.
I had the Fatcat on my old 95" high compression Heritage. The bike ran super(over 100/00 HP/TQ)& the fit/finish was outstanding(100 times better than a t-header) but IMHO they where too loud for all day cruising.
I now have a 95" H.C. bagger & I went with a Supertrapp Supermeg 2-1 just because I thought the F.C would be too loud.
I just recieved mine on my 06 eg with a 95" build. My dealer purchased mine directly from D&D. I think the price was about 660$ this was with the big bore baffle. It is a loud pipe but in a good way (deep hard bark). Sort of reminds me of Sampson duals with no baffles.
Just finished the install of my new FatCat on a 80"Evo Mods include 10.5 comp.,#54 SE cam 42mm Mikuni. Sound is almost as loud as my old T-header but not as Tight and Pi$$ed-off, more rummble and less bang I guess you'd say.