While at first I was impressed with my LTZ's speakers, I will chalk this up to newfound joy in my first car. Now when i play with the stereo i realize the mush that is the rear audio. Now I am seriously considering putting in a custom stereo, with orion 6.5s in the front doors and pioneers in the back doors. id probably go with a kicker amp and worry about some hardcore subs later. anyone had any real luck with installing their own stereo? any rumors as to when upgrade packages can be expected from Chevy?