Dynomax muffler - some questions

[Vendetta]

I went with the AeroTurbine AT2525XL. I LOVE the way it sounds from the outside, but it's a little too resonant in the cabin for my taste.

That said, I saw, listened, and even DROVE Gussie's true-dual Dynomax SuperTurbo setup and can say with confidence that it sounds freakin' incredible. VERY quiet on start and idle and ordinary driving - but when you get on it, it growls like a badass.

I'd like to end up somewhere in between where I am now and where Gussie's is, honestly. So I ask the experts out there, will adding a second muffler in a dual exhaust setup quiet the note somewhat, given the reduced flow through each muffler? Or is the opposite the case, that adding the second will just make it louder and more resonant in the cabin?

OR... third option - just Dynamat the hell out of my interior?

Decisions decisions...