
The options are many but here are a few.
Fuel Moto sells a Stage one AC kit for a reasonable dollar ($140?

) in non-chrome back plate. They also sell a chrome backplate (no idea on the price) that looks like chrome. My Se Ultra has the non-chrome and matches the engine fins just fine either. Either is a great choice.
You can go with the Arlen Ness series and they look good and work well.
All of these will free up the breathing.
With a new AC, non-cat pipes and a free flowing exhaust, I would suggest installing a Power Commander V with autotune, Master tune TTS, fuel pak from V&H or some other fuel management system. I am not particularly fond of the HD SSERT but a lot of bikes have them.
I have Rinehart slip-ons on my my bike and truly love the sound. Pipes are a very subjective thing. Lots of guys go 2 into 1, true duals, Full Sac replacement baffles ( another good choice because you can pick how loud you want), V&H pro Pipes with V&H slipons, Jackpots', Bub 7's, Rush and I am sure a whole lot more.
I spent about an hour on the phone with the Fuel Moto people and they were great.
Yes, let the beast breathe and be free. The cat alone is a huge improvement.
