I used to have 12" glasspacks (same thing as cherrybombs, different company), 2" pipes, headers, and 24x3 echo tips on my truck. It was a little quieter than my 2.5" system with Delta Flow 40's on it. Also, i don't run any tailpipes. The mufflers just end above my rear axle. When i ran turndowns on it, the flows were quieter than my old glasspacks.
It can be a bit obnioxus, i took a 4hr trip in it not too long ago, and pulling 3000rpm the whole way, my ears hurt a little bit when i was done
Sounds great though! I turn heads everywhere if i give the truck a bit of throttle.