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Hey, I am planning on installing an 05 NAV in my 04 CTS. I have seen (and think I can do) the install. The one question still outstanding is the install of the XM box. I see people write about the need to have a box in the trunk for XM but there is no discussion of it as related to install. Is there a factory specific box I would need to consider and wire or is it just a antenna out of the NAV unit (and subscription of course)? I am starting to pull all the pieces together and I think this is the last one. Advise would be greatly appreciated. Thanks BG
 
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