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After you feel the extremely excessive amount of heat that it generates because of the catalytic converter, you might reconsider new head pipes! It's pretty bad. I did just slip-ons on my 09 Classic (no cat in the 09s), but on my 2011 Limited Ultra, the heat was almost unbearable. I went with Vance & Hines Power Duals. It's fun to ride now. You'll see what I mean about the heat.
I changed just my slip-ons at first on my 14 Limited and it didn't cool anything down at all and it sounded exactly like stock. I then added a set of Vance and Hines power duals head pipes and its a little cooler and the sound is great.