I have a magnaflow muffler, to a glass pack, then to a Y and two tips. The system is lighter then stock and flows much better. Also it sounds pretty good too a little drone on the hwy but great at wot or idle. But I suspect most of the drone is from the exhaust leak I have where I have to cut out part of my exhaust to do the headers. When the topswap is done I will have it welded up and it should go away