Dynomax crossflow is the ticket for mellow 2 in 2 out.
I looked on E-bay and found several 2 in 2 out mufflers. some list their sound levels as aggressive. Found a Walker muffler no. 22395 that i ordered from my local FLAPS. It will be a while, but I'll let you know how its sounds.I will look for something that "promise's to be quite.
It's the 226 in an F3 flat bed. I still like quite but mellow might be ok. Thanks