I've got Bub7's True Duals on my '09 FLTR. Love the sound, but they are on the loud side - especially running with the slash tips aligned withe slope of the bags (pointing up). Not nearly as loud as open pipes, but they are far from OEM.
I heard a set of pipes from a company called Freedom Performance. They are the deepest sounding pipes I have ever heard. I run Bub7 slip ons on my 09 Ultra and thought they were deep until I heard the pipes from Freedom. Their web site is freedomperformance.com
BUB7 True Duals here. Love the sound. Agree with one of the replies that stated they are on the loud side. At idle and low throttle they have a nice deep tone. I have ridden on another bike following mine and I grin every time I hear the throttle crack open.