As far as the onstar is concerned, no but you might be able to hide the new bt mic in the housing. Some where I saw where you could swap out the newer (07) buttons with bt and make it work. Good luck.
I'm installing a used Pioneer AVIC F700BT w XM into my 05 Z71 using the before mentioned kits. I like the AVIC F series because the system can be hacked and modded easy. Hardest part to the install is soldering the harness. Pretty easy really. Good Luck.
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