“I'm buying a sirius radio with car kit what else will I need to hook it up to a 2003 gmc Sierra”
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If you are purchasing an Onyx Plus or EZR you can connect the audio to either the AUX audio input (if your radio has one) or use the FM via the Power Connect system in the Onyx plus. We would recommend adding the FMDA25 for a better FM performance - please consult your local installer for more details and options
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