Metra 70-1857 Tuner Relocation and Bose Integration Harness for Select GM Vehicles Plugs into car harness at radio Power 4 speaker This product is manufactured in china 17" Tuner relocation bypass harness and Bose amplifier integration harness Retains factory Bose system Includes antenna extension 21-pin plug ; enter year, make,model to check compatibility. Allows for the installation of an aftermarket radio using the existing factory wiring and connectors