THERE IS AN ADAPTER THAT IS MADE SO THAT YOU CAN STILL KEEP YOUR STEERING WHEEL CONTROLS WHEN YOU GO INTO AFTERMARKET STEREOS. XM WAS NOT OFFERRED AND I WILL GET YOU THE BRAND NAME FOR THE ADAPTER IT SELLS FOR ABOUT $70 I AM GETTING MINE INSTALLED ON FRIDAY. GETTING A ZAPCO 350 FOR SUBWOOFER AND A ZAPCO 350X2 FOR THE MIDS AND HIGHS. SUBWOOFER IS A JL AUDIO 10W6 AND SPEAKERS FOR FRONT AND MIDDLE DOORS ARE POLK AUDIO MOMOS 6 1/2 WITH SEPARATE TWEETERS, ALPINE HEAD UNIT WITH 6 DISC CHANGER. THEY ALSO NOW MAKE AN ADAPTER FOR THE ONSTAR SO YOU DON'T HAVE TO MODIFY ANYTHING. WILL LET YOU KNOW HOW INSTALL GOES, AMPS AND SPEAKERS ARE ALREADY INSTALLED. BUT BOSE HEAD UNIT STILL WEAK SO AM UPGRADING TO ALPINE HEAD UNIT WITH XM.
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