I replaced my speakers with MBQuart, both front and rear, installed a 5-channel Xtant amp and a single 10" Orion Sub using the stock head unit.....sounds MUCH better than factory.
I have not replaced the head unit because I was waiting for an in-dash screen that was of reputable quality....Alpine, Kenwood, etc. I have been reading and I do believe that Kenwood is now making something...I've been partial to Alpine in the past for quality reasons.
Anyway....wanted to let you know what I've done. One key thing to remember....in order to tie-in to the existing system...you'll need to have an amp that can accept an 'already amplified' signal....The only downside to my installation is that when the key is turned off..the only speakers that remain powered up are the ones way in the rear....the Onstar speakers....kinda defeats the feature of being able to listen to music until the doors open..but there ARE worse things.
Let me know if you have any specific questions.
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