I removed the Cat from my 2010 Ultra to get rid of some heat...Ended up with nice sound from the stock pipes....I was surprised I didn't ever need other pipes
Hap

 

I have a set of Klockworks 4in supersavers on my limited, they are a little louder than stock, mellow cruising, and bark when you twist the wick. People have told me that the sound great while riding behind me. You can find em on fleabay, think I paid round 230 for em. Have had them for 2 years now and they still look great. Good luck man.

 

I have the superflow mufflers also and love them