THEY ARE NOT DONE WITH IT YET. STILL WAITING FOR ONSTAR ADAPTER AND CB INSTALL. SO FAR HAVE ZAPCO 350X2 RUNNING POLKAUDIO MOMO SERIES ON FRONT AND BACK DOORS WITH TWEETERS REPLACING BOSE , JL AUDIO 10W3 SUB IN BACK DRIVEN BY ZAPCO 350, AND WENT WITH KENWOOD CD WITH SIRIUS TUNER, AND STEERING WHEEL ADAPTER. SO FAR ROUGHLY AROUND $4000