circuit city / best buy sell the wiring harness that eliminates the stock radio for $100.--in my buddies we used the gmos04---he had bose; if you dont have bose its the gmos01---both made by metra. also, i believe he said after install, the buttons on the right side of the guages no longer beep when the buttons are pressed.
99 M6 t-top leather silver/pewter Z-28, 408ci, 471hp, 465tq
09 Diamond White Escalade
2013 Glacier White Audi S5