GSR allows you to add SiriusXM satellite radio directly to compatible Toyota, Scion, Honda, Hyundai, Ford, Dodge, Chrysler, Jeep, Fiat, Nissan, Mazda, Porsche, Chevrolet, GMC, Mercedes, Volkswagen, Land Rover, Alfa Romeo or Subaru factory radios. You can control all SiriusXM channels through your factory radio without replacing it. GSR requires a SXV300 universal SiriusXM tuner. A GSR tuner kit includes both the GSR interface module plus a SXV300 tuner.