The older I get the less I enjoy hearing the sound of the pipes. What is the quietest slip on mufflers available for 1 3/4 Tru Dual head pipes. If I could even get the purring sound of a Goldwing I would be very happy.
Take a set of stock mufflers and put them on. I'm not sure why you went to a true dual system and want it as quiet as possible but that would do it. Something moderate would be Rush slip ons or SE mufflers. You would have to check fitment though.
I just bought the V&H twin slash slip-ons. Like you, my older ears don't need anymore hearing loss. The sound is there when needed, but pleasant enough while cruising. Also, great price and quality for the money. Very happy
If you want quite, then the stock exhaust is going to be the ticket. From there I would look at the SE performance touring mufflers. They will be second quietest. From there, you go the fuel moto or rush route for the next level.