Well itsahog,, Let me tell you my story on pipes,,, I put a set of JackPots on my 09 Street Glide ,, Liked the Sound ,, Just wish they were a little deeper tone,, I also Bought a 09 Root Beer Ultra on the 29th of June (Sold the Street Glide last Friday),, Put a set of HD Fatshotz's on the 09 Ultra,,, This is the sound I have been looking for Deeper Lower Sound than the Jackpots but louder than the Monster Ovals,,, i love these Pipes With Just a Stock Air/Cleaner and a Boyesen X Wing installed the Ultra runs a Lot Better than Before..
The Key to all of this is the HD Fatshotz's are made a for the 2010 & 2011 Touring Bikes with Catalytic Converters in the Head Pipe,, So they are made to flow more exhaust and if your Ultra does not have a Cat in the head pipe than this is the way to go,,,