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he XM5-GM9 will allow direct audio input of the XM 5 Volt units, as well as the SIRIUS 5 Volt Units (SIRIUS S50 and new Sportster 4) through the CD Changer port of the OEM GMC radio for optimal sound quality. The built-in 5-volt power supply of the XM5-GM9 powers the Satellite Radio unit directly, eliminating the need to use the external cigarette lighter adapter. Will hardwire Audio and Power ...more