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<blockquote data-quote="AlterEgo99" data-source="post: 6916780" data-attributes="member: 610253">The stuff you have italicized is for separate speakers in order to continue using OnStar and for door chimes.&nbsp; Yes, the harness is designed to retain OnStar and door chimes, but without speakers you will not be able to hear anything.&nbsp; The Metra SP-2003&#039;s that are referenced are the speakers they recommend and which you can purchase at Parts Express:<a href="http://www.parts-express.com/pe/showdetl.cfm?Partnumber=265-842%20%20%20%20%20%20%20%20&amp;amp;FTR=metra%20sp-2003&amp;amp;CFID=2288538&amp;amp;CFTOKEN=23906631" target="_blank">Metra SP-2003 GM Door Chime Speaker | Parts-Express.com</a>I purchased two and mounted them up under my dash on the driver&#039;s side.&nbsp; I determined that once you toss the OEM H/U, you sacrifice getting OnStar or the door chimes to use the stereo speakers, be they OEM or aftermarket.&nbsp; For me, I preferred that anyways.&nbsp; And I think if you attempted to cut into the stereo speaker wires for OnStar and door chimes you could be adding noise into the system, but I never tested that.I know all this as I have an &#039;08 Silverado with OnStar and a Bose system.&nbsp; My install involved removing ALL OEM crap, including the Bose, and installing all aftermarket.&nbsp; I used the GMOS-01 harness for my install as well.Hope this helps.</blockquote>

[QUOTE="AlterEgo99, post: 6916780, member: 610253"] The stuff you have italicized is for separate speakers in order to continue using OnStar and for door chimes. Yes, the harness is designed to retain OnStar and door chimes, but without speakers you will not be able to hear anything. The Metra SP-2003's that are referenced are the speakers they recommend and which you can purchase at Parts Express: [URL="http://www.parts-express.com/pe/showdetl.cfm?Partnumber=265-842%20%20%20%20%20%20%20%20&FTR=metra%20sp-2003&CFID=2288538&CFTOKEN=23906631"]Metra SP-2003 GM Door Chime Speaker | Parts-Express.com[/URL] I purchased two and mounted them up under my dash on the driver's side. I determined that once you toss the OEM H/U, you sacrifice getting OnStar or the door chimes to use the stereo speakers, be they OEM or aftermarket. For me, I preferred that anyways. And I think if you attempted to cut into the stereo speaker wires for OnStar and door chimes you could be adding noise into the system, but I never tested that. I know all this as I have an '08 Silverado with OnStar and a Bose system. My install involved removing ALL OEM crap, including the Bose, and installing all aftermarket. I used the GMOS-01 harness for my install as well. Hope this helps. [/QUOTE]

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