There is a wiring harness that hooks right in line with the after market radio (via plug and play plugs). It does cost about 150.00 you can get these at most any professional audio/upgrade store. This wiring harness allows you to use your exsiting speakers still. The onstar does go thru the speakers, but there is no reason to add seperate speakers. I just did this with my H3 2 days ago.
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