You are correct that the Dynomax Ultraflow mufflers are what you want. They are sporty & throaty sounding.
Magnaflows are a bit loud & boomy. Kind of small block reminiscent. (slightly) They can be annoying because they are boomy.
Flowmaster sucks. Loud, droning, boomy, and they are not straight through design. They serve one purpose in life. They sound decent on a small displacement V8. Skip them at all cost.
