Might be a little late but..... you might want to see who makes the best performing dresser / true dual systems. There are several out there. Another possibility is a system like S&S and Khome Werks make with a hidden chamber. Both pipes are supposed to run really good.
I'm a vance and hines fan, so I am really not looking at any other system
I really like my power duals, if I had anything less than positive to say it's that they are easier to drag. Last summer I scarred mine, drug the bottom rear of the x, just hoping no rust sets in.