It's a matter of personal preference. "Loud" varies from individual to individual.
I ran a 3" Single for a couple of years. Ultimately concluded (with urging from my wife and daughter) that it was just too loud. Just right for some, too loud for me.
Switched to the dual 2 1/2" system and it was significantly quieter, at all RPM's.
The 2 1/2" system was 20 pounds heavier, and more expensive. I noticed no performance difference at the track when switching and running both systems capped up.
If I had it to do over again, I would of gone straight to the duals.