The Muffler Shoppe Plus Auto Service is conveniently located in Charlevoix, MI. Our shop is staffed with expert technicians who provide quality repair and maintenance service. Call or email us to set up an appointment today. The Muffler Shoppe Plus Auto Service is conveniently located in Charlevoix, MI. Our shop is staffed with expert technicians who provide quality repair and maintenance service. Call or email us to set up an appointment today.