Hi ! i have a trailblazer LT 2004 and i have a rear seat roof dvd player, and i have some control buttons on the steering wheel for the stereo as well. I would like to know if my model has a factory amp, and if it does where ? I'm not sure if my system is BOSS i dont see any boss written any where for sure at least not on the speakers ! Kindly let me know if my car is equipped with an amp.