I have stainless Mistrals on the V7S - dB killers in. Louder and harsher than the Stainintunes & the Agostinins, which I prefer. The Ago's have more bass, a huge amount more bass without the dB killers.
I would get the Ago's - they fit the Agostini headers, which you may eventually have to consider once the Italian chrome of the stock headers completely disappears.
Off the bike, I prefer the sound of the Ago's, then the Staintunes before the Mistrals. On the bike, riding, you get feedback with the Mistrals, constantly, but only you don't hear the Staintunes or Ago's over the wind & engine noise mostly, heavy gear & throttle use on twisty roads through forests & mountains being the delightful exception.