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I have an '05 sts which is supposed to be "xm ready". However no matter how hard I try I can't get any information on how,when,etc. this can happen. Is there a module added under-dash,or how is it done? The local G.M. dealer has no information. Can I just go down to the U.S. and purchase The required hardware? Any information would be greatly appreciated. Howie X
 
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