i recomend the hks super dragger, although it comes out straight it still flows very well (mine is 3.5" cat back, hiflow cat, and 3" front) they arent droney like what vspecv has said also, and they look damn horn, just massive muffler lol but yeah it is nice and quiet in cabin, and it only gets loud when your cat gasket falls off (like mine did, all fixed now).
its just super quiet