Its really all about opinion. Personally I despise Dynomax...at least in side exhaust form. I have 2 chamber flows, and can't wait to throw them in the garbage. Even with my cam, every time I hear a Mustang roll by, I think its mine
I really like the flowpath catback, and Borlas too..pretty quiet at idle and nice and throaty in the higher rpms. On a modular I really like an offroad H pipe with 3 chamber flows.