Hi, first time poster occasional reader... i have a 2006 STS that I got for my wife... So far I changed the sparks and one coil that was bad to eliminate a Misfire on 5 code.. I had my windows tinted .. And I changed the stock Brakes to Slotted and drilled rotors,.. But now im getting a high pitched squeel that comes right out of the sub woofer I tried closing doors.. moving settings,.. and then it just stops... 20 to 30 minutes later you could be cruisinb along and WEEEEEEEEEEEEEEEEEE.. I had heard some one say that they had a problem with a Bose system that sounded similar to my problem... when I disconect the bose amp.... no Sound..... no squeel.....Is my amp blown or is the Woofer gone... Dont know how to diagnose.. Any Ideas?