Quiet muffler choices

VOETOM has forgotten more about mufflers than i will ever know, but i know that if you want quiet, and good flow, get a large enough pipe, and the biggest, longest muffler you can get under the car. And quiet will usually be a triple pass.
I do have some 3 1/2 in/out flowmasters that i consider quiet(you might not), but they are a HUGE case, 5x12, 24"long.