I recently had ARH's and ORY onto my existing TSP Rumbler catback. It made great power and fit great, but the rasp was terrible. So I took some measurements and order a Magnaflow 4x9 3" in/out (for $75), and had my local muffler shop swap it in today(for $40) right where the dynamax (I think that's what TSP puts on there) bullet was.
IT SOUNDS SO MUCH BETTER. It is a lot quieter, but really deep and
all the rasp is gone.
Just wanted to let ya'll know my experience in case anyone ever is in the same boat. Was gonna be temporary til I went true duals but I don't know now, might just keep it for a while.