Electronic muffler, condition guaranteed, opens and closes, its sound is pleasant 😃 Comes with the device, bought new, its box is with me, and two remotes. (Currently installed on a Sierra 13, and before that on a Sierra 15) Reason for selling: I want to save myself from fines. Message me on WhatsApp or call me, I'll send a video of the muffler sound. Currently installed in the car.