Best thing about the Apexi RS/WS is that u can actually hear the person in the back letting one rip.....hehehe....yes, its that quite. Yet when you drive spiritedly, it growls back in a low deep and well behaved manner. If you also happen to have an intake (cold or short) you're guaranteed to be able to hear the intake growl over the exhaust, and that combination is actually quite nice for people that have daily driven cars and do some long distance driving once in a while.