So,
I wanted some louder pipes on my 2015 CVO Limited also....some pipes that don't sound like a high end lawn mower such as the stock CVO pipes ( I live in California.....).
I replaced the exhaust system with the Screaming' Eagle Hi-Flo exhaust with Street Cannons.
This moves the catalytic converter back into the pipes, giving me two and almost twice the flow than the stock. a bit cooler, too, as the cats are now further behind me and one on each side.
Does it sound better? Yes. Like I wanted? Not really, but I did get better throttle response with the higher flow and remapping.
The pipes are a bit deeper than stock and not so loud I cannot listen to my music, but not as attention grabbing and the V&H system I was initially planning on.
Read up on the Street Cannons - many say they don't like the sound after about 2,500 miles. I good with it for now, after about 8k.