Just putting in my 2 cents worth.
I have the fullsac X-pipe, Rinehart 4" mufflers with the 2 1/2" baffles and running the SE Super Tuner. It took quite a few rides and data recordings to get a good tune but I am very happy with the way my bike runs. It has good throttle response off of idle and pulls strong through the whole RPM range. I get an average fuel economy of 42MPG. No exhaust smell. The noise level from the mufflers is not to loud when riding on the hwy. Can talk to my wife with no problems hearing. Can hear the radio just fine also. The mufflers will definitely get loud when you crank open the throttle. I have 20,000 miles on her and still running great.
Note: I did try true dual head pipes and 3 different sets of mufflers (BUB7, V&H Hi-Output, Rinehart's) before I found the sound I liked and the low end power that I was looking for.