Their just simply my favorite. I would like to believe someday that flowmasters will be a thing of the past and everyone will be like "remember those horrible mufflers we put on our cars back then?"
sorry just like said above spinning 6k with an x pipe and these mufflers is like nothing else.
Another brand that impressed my is pypes exhaust. Their mufflers sound pretty clean as well. They aren't to quiet but not obnoxious unless you get their "violators?" I think they are called.