My D&D's were on the bike when I bought it and had the option of replacing with stock set-up but to me that was no option. I left it up to my wife in reality, when i ask her if the D&D's seemed loud. She thought they were fine so they stayed on.
A Triumph aftermarket silencer tune was used but my dealer didn't know which one and the bike ran so well i didn't pursue it further. Your dealer should know exactly what tune to use.
It just came to me why you like the D&D's,......their made in Texas......HA HA!!!